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Finding the Fourth Proportional to 1,591.48, 2,387.46 and 861.16

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Solution

The fourth proportional to 1,591.48, 2,387.46 and 861.16 is: 1,291.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,591.48 : 2,387.46 = 861.16 : x
  2. Step 2: Convert to fraction form
    1,591.48/2,387.46 = 861.16/x
  3. Step 3: Cross multiply
    1,591.48x = 2,387.46 × 861.16
  4. Step 4: Simplify right side
    1,591.48x = 2,055,985.05
  5. Step 5: Solve for x
    x = 2,055,985.05/1,591.48
  6. Step 6: Final answer
    x = 1,291.87

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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.