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Finding the Fourth Proportional to 721.02, 1,082.34 and 478.02

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Solution

The fourth proportional to 721.02, 1,082.34 and 478.02 is: 717.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.02 : 1,082.34 = 478.02 : x
  2. Step 2: Convert to fraction form
    721.02/1,082.34 = 478.02/x
  3. Step 3: Cross multiply
    721.02x = 1,082.34 × 478.02
  4. Step 4: Simplify right side
    721.02x = 517,380.17
  5. Step 5: Solve for x
    x = 517,380.17/721.02
  6. Step 6: Final answer
    x = 717.57

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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.