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Finding the Fourth Proportional to 839.60, 1,252.66 and 747.20

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Solution

The fourth proportional to 839.60, 1,252.66 and 747.20 is: 1,114.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    839.60 : 1,252.66 = 747.20 : x
  2. Step 2: Convert to fraction form
    839.60/1,252.66 = 747.20/x
  3. Step 3: Cross multiply
    839.60x = 1,252.66 × 747.20
  4. Step 4: Simplify right side
    839.60x = 935,987.55
  5. Step 5: Solve for x
    x = 935,987.55/839.60
  6. Step 6: Final answer
    x = 1,114.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.