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Finding the Fourth Proportional to 721.55, 1,082.05 and 234.47

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Solution

The fourth proportional to 721.55, 1,082.05 and 234.47 is: 351.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.55 : 1,082.05 = 234.47 : x
  2. Step 2: Convert to fraction form
    721.55/1,082.05 = 234.47/x
  3. Step 3: Cross multiply
    721.55x = 1,082.05 × 234.47
  4. Step 4: Simplify right side
    721.55x = 253,708.26
  5. Step 5: Solve for x
    x = 253,708.26/721.55
  6. Step 6: Final answer
    x = 351.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.