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Finding the Fourth Proportional to 721.96, 1,082.91 and 578.59

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Solution

The fourth proportional to 721.96, 1,082.91 and 578.59 is: 867.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.96 : 1,082.91 = 578.59 : x
  2. Step 2: Convert to fraction form
    721.96/1,082.91 = 578.59/x
  3. Step 3: Cross multiply
    721.96x = 1,082.91 × 578.59
  4. Step 4: Simplify right side
    721.96x = 626,560.90
  5. Step 5: Solve for x
    x = 626,560.90/721.96
  6. Step 6: Final answer
    x = 867.86

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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.