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Finding the Fourth Proportional to 747.85, 1,121.79 and 418.60

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Solution

The fourth proportional to 747.85, 1,121.79 and 418.60 is: 627.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.85 : 1,121.79 = 418.60 : x
  2. Step 2: Convert to fraction form
    747.85/1,121.79 = 418.60/x
  3. Step 3: Cross multiply
    747.85x = 1,121.79 × 418.60
  4. Step 4: Simplify right side
    747.85x = 469,581.29
  5. Step 5: Solve for x
    x = 469,581.29/747.85
  6. Step 6: Final answer
    x = 627.91

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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.