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Finding the Fourth Proportional to 721.39, 1,082.04 and 304.75

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Solution

The fourth proportional to 721.39, 1,082.04 and 304.75 is: 457.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.39 : 1,082.04 = 304.75 : x
  2. Step 2: Convert to fraction form
    721.39/1,082.04 = 304.75/x
  3. Step 3: Cross multiply
    721.39x = 1,082.04 × 304.75
  4. Step 4: Simplify right side
    721.39x = 329,747.53
  5. Step 5: Solve for x
    x = 329,747.53/721.39
  6. Step 6: Final answer
    x = 457.10

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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.