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Finding the Fourth Proportional to 748.62, 1,123.74 and 721.08

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Solution

The fourth proportional to 748.62, 1,123.74 and 721.08 is: 1,082.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.62 : 1,123.74 = 721.08 : x
  2. Step 2: Convert to fraction form
    748.62/1,123.74 = 721.08/x
  3. Step 3: Cross multiply
    748.62x = 1,123.74 × 721.08
  4. Step 4: Simplify right side
    748.62x = 810,306.44
  5. Step 5: Solve for x
    x = 810,306.44/748.62
  6. Step 6: Final answer
    x = 1,082.40

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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.