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Finding the Fourth Proportional to 729.32, 1,006.72 and 430.70

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Solution

The fourth proportional to 729.32, 1,006.72 and 430.70 is: 594.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.32 : 1,006.72 = 430.70 : x
  2. Step 2: Convert to fraction form
    729.32/1,006.72 = 430.70/x
  3. Step 3: Cross multiply
    729.32x = 1,006.72 × 430.70
  4. Step 4: Simplify right side
    729.32x = 433,594.30
  5. Step 5: Solve for x
    x = 433,594.30/729.32
  6. Step 6: Final answer
    x = 594.52

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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.