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Finding the Fourth Proportional to 717,396.31, 990,051.68 and 395,106.32

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Solution

The fourth proportional to 717,396.31, 990,051.68 and 395,106.32 is: 545,271.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,396.31 : 990,051.68 = 395,106.32 : x
  2. Step 2: Convert to fraction form
    717,396.31/990,051.68 = 395,106.32/x
  3. Step 3: Cross multiply
    717,396.31x = 990,051.68 × 395,106.32
  4. Step 4: Simplify right side
    717,396.31x = 391,175,679,357.51
  5. Step 5: Solve for x
    x = 391,175,679,357.51/717,396.31
  6. Step 6: Final answer
    x = 545,271.38

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Half scale
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Double scale
Find fourth proportional to 717,397.31, 990,053.06 and 395,107.32
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.