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Finding the Fourth Proportional to 487,859.90, 731,789.85 and 320,438.30

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Solution

The fourth proportional to 487,859.90, 731,789.85 and 320,438.30 is: 480,657.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,859.90 : 731,789.85 = 320,438.30 : x
  2. Step 2: Convert to fraction form
    487,859.90/731,789.85 = 320,438.30/x
  3. Step 3: Cross multiply
    487,859.90x = 731,789.85 × 320,438.30
  4. Step 4: Simplify right side
    487,859.90x = 234,493,495,491.26
  5. Step 5: Solve for x
    x = 234,493,495,491.26/487,859.90
  6. Step 6: Final answer
    x = 480,657.45

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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.