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Finding the Fourth Proportional to 729.46, 1,006.62 and 397.89

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Solution

The fourth proportional to 729.46, 1,006.62 and 397.89 is: 549.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.46 : 1,006.62 = 397.89 : x
  2. Step 2: Convert to fraction form
    729.46/1,006.62 = 397.89/x
  3. Step 3: Cross multiply
    729.46x = 1,006.62 × 397.89
  4. Step 4: Simplify right side
    729.46x = 400,524.03
  5. Step 5: Solve for x
    x = 400,524.03/729.46
  6. Step 6: Final answer
    x = 549.07

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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.