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Finding the Fourth Proportional to 729.41, 1,006.61 and 397.85

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Solution

The fourth proportional to 729.41, 1,006.61 and 397.85 is: 549.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.41 : 1,006.61 = 397.85 : x
  2. Step 2: Convert to fraction form
    729.41/1,006.61 = 397.85/x
  3. Step 3: Cross multiply
    729.41x = 1,006.61 × 397.85
  4. Step 4: Simplify right side
    729.41x = 400,479.79
  5. Step 5: Solve for x
    x = 400,479.79/729.41
  6. Step 6: Final answer
    x = 549.05

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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.