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Finding the Fourth Proportional to 1,591.48, 2,385.96 and 724.78

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Solution

The fourth proportional to 1,591.48, 2,385.96 and 724.78 is: 1,086.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,591.48 : 2,385.96 = 724.78 : x
  2. Step 2: Convert to fraction form
    1,591.48/2,385.96 = 724.78/x
  3. Step 3: Cross multiply
    1,591.48x = 2,385.96 × 724.78
  4. Step 4: Simplify right side
    1,591.48x = 1,729,296.09
  5. Step 5: Solve for x
    x = 1,729,296.09/1,591.48
  6. Step 6: Final answer
    x = 1,086.60

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1.5x scale

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.