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Finding the Fourth Proportional to 747.73, 1,120.69 and 418.57

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Solution

The fourth proportional to 747.73, 1,120.69 and 418.57 is: 627.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.73 : 1,120.69 = 418.57 : x
  2. Step 2: Convert to fraction form
    747.73/1,120.69 = 418.57/x
  3. Step 3: Cross multiply
    747.73x = 1,120.69 × 418.57
  4. Step 4: Simplify right side
    747.73x = 469,082.58
  5. Step 5: Solve for x
    x = 469,082.58/747.73
  6. Step 6: Final answer
    x = 627.34

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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.