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Finding the Fourth Proportional to 729.64, 1,006.65 and 493.90

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Solution

The fourth proportional to 729.64, 1,006.65 and 493.90 is: 681.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.64 : 1,006.65 = 493.90 : x
  2. Step 2: Convert to fraction form
    729.64/1,006.65 = 493.90/x
  3. Step 3: Cross multiply
    729.64x = 1,006.65 × 493.90
  4. Step 4: Simplify right side
    729.64x = 497,184.44
  5. Step 5: Solve for x
    x = 497,184.44/729.64
  6. Step 6: Final answer
    x = 681.41

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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.