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Finding the Fourth Proportional to 861.47, 1,187.45 and 581.62

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Solution

The fourth proportional to 861.47, 1,187.45 and 581.62 is: 801.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.47 : 1,187.45 = 581.62 : x
  2. Step 2: Convert to fraction form
    861.47/1,187.45 = 581.62/x
  3. Step 3: Cross multiply
    861.47x = 1,187.45 × 581.62
  4. Step 4: Simplify right side
    861.47x = 690,644.84
  5. Step 5: Solve for x
    x = 690,644.84/861.47
  6. Step 6: Final answer
    x = 801.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.