Home / 717,811.20-990,623.64-395,521.20

Finding the Fourth Proportional to 717,811.20, 990,623.64 and 395,521.20

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Solution

The fourth proportional to 717,811.20, 990,623.64 and 395,521.20 is: 545,843.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,811.20 : 990,623.64 = 395,521.20 : x
  2. Step 2: Convert to fraction form
    717,811.20/990,623.64 = 395,521.20/x
  3. Step 3: Cross multiply
    717,811.20x = 990,623.64 × 395,521.20
  4. Step 4: Simplify right side
    717,811.20x = 391,812,650,841.17
  5. Step 5: Solve for x
    x = 391,812,650,841.17/717,811.20
  6. Step 6: Final answer
    x = 545,843.60

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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.