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Finding the Fourth Proportional to 487,564.20, 731,346.30 and 398,917.80

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Solution

The fourth proportional to 487,564.20, 731,346.30 and 398,917.80 is: 598,376.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,564.20 : 731,346.30 = 398,917.80 : x
  2. Step 2: Convert to fraction form
    487,564.20/731,346.30 = 398,917.80/x
  3. Step 3: Cross multiply
    487,564.20x = 731,346.30 × 398,917.80
  4. Step 4: Simplify right side
    487,564.20x = 291,747,057,034.14
  5. Step 5: Solve for x
    x = 291,747,057,034.14/487,564.20
  6. Step 6: Final answer
    x = 598,376.70

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.