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Finding the Fourth Proportional to 729.28, 1,006.80 and 493.40

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Solution

The fourth proportional to 729.28, 1,006.80 and 493.40 is: 681.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.28 : 1,006.80 = 493.40 : x
  2. Step 2: Convert to fraction form
    729.28/1,006.80 = 493.40/x
  3. Step 3: Cross multiply
    729.28x = 1,006.80 × 493.40
  4. Step 4: Simplify right side
    729.28x = 496,755.12
  5. Step 5: Solve for x
    x = 496,755.12/729.28
  6. Step 6: Final answer
    x = 681.16

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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.