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Finding the Fourth Proportional to 724.83, 1,000.42 and 445.30

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Solution

The fourth proportional to 724.83, 1,000.42 and 445.30 is: 614.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.83 : 1,000.42 = 445.30 : x
  2. Step 2: Convert to fraction form
    724.83/1,000.42 = 445.30/x
  3. Step 3: Cross multiply
    724.83x = 1,000.42 × 445.30
  4. Step 4: Simplify right side
    724.83x = 445,491.21
  5. Step 5: Solve for x
    x = 445,491.21/724.83
  6. Step 6: Final answer
    x = 614.62

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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.