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Finding the Fourth Proportional to 932.90, 1,287.12 and 539.88

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Solution

The fourth proportional to 932.90, 1,287.12 and 539.88 is: 744.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.90 : 1,287.12 = 539.88 : x
  2. Step 2: Convert to fraction form
    932.90/1,287.12 = 539.88/x
  3. Step 3: Cross multiply
    932.90x = 1,287.12 × 539.88
  4. Step 4: Simplify right side
    932.90x = 694,890.35
  5. Step 5: Solve for x
    x = 694,890.35/932.90
  6. Step 6: Final answer
    x = 744.87

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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.