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Finding the Fourth Proportional to 717,455.80, 990,095.70 and 395,167.06

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Solution

The fourth proportional to 717,455.80, 990,095.70 and 395,167.06 is: 545,334.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,455.80 : 990,095.70 = 395,167.06 : x
  2. Step 2: Convert to fraction form
    717,455.80/990,095.70 = 395,167.06/x
  3. Step 3: Cross multiply
    717,455.80x = 990,095.70 × 395,167.06
  4. Step 4: Simplify right side
    717,455.80x = 391,253,206,887.64
  5. Step 5: Solve for x
    x = 391,253,206,887.64/717,455.80
  6. Step 6: Final answer
    x = 545,334.23

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Half scale
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Double scale
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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.