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Finding the Fourth Proportional to 729.38, 1,005.63 and 571.52

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Solution

The fourth proportional to 729.38, 1,005.63 and 571.52 is: 787.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.38 : 1,005.63 = 571.52 : x
  2. Step 2: Convert to fraction form
    729.38/1,005.63 = 571.52/x
  3. Step 3: Cross multiply
    729.38x = 1,005.63 × 571.52
  4. Step 4: Simplify right side
    729.38x = 574,732.63
  5. Step 5: Solve for x
    x = 574,732.63/729.38
  6. Step 6: Final answer
    x = 787.98

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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.