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Finding the Fourth Proportional to 721.42, 1,082.02 and 412.27

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Solution

The fourth proportional to 721.42, 1,082.02 and 412.27 is: 618.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.42 : 1,082.02 = 412.27 : x
  2. Step 2: Convert to fraction form
    721.42/1,082.02 = 412.27/x
  3. Step 3: Cross multiply
    721.42x = 1,082.02 × 412.27
  4. Step 4: Simplify right side
    721.42x = 446,084.39
  5. Step 5: Solve for x
    x = 446,084.39/721.42
  6. Step 6: Final answer
    x = 618.34

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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.