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Finding the Fourth Proportional to 861.14, 1,188.24 and 580.92

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Solution

The fourth proportional to 861.14, 1,188.24 and 580.92 is: 801.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.14 : 1,188.24 = 580.92 : x
  2. Step 2: Convert to fraction form
    861.14/1,188.24 = 580.92/x
  3. Step 3: Cross multiply
    861.14x = 1,188.24 × 580.92
  4. Step 4: Simplify right side
    861.14x = 690,272.38
  5. Step 5: Solve for x
    x = 690,272.38/861.14
  6. Step 6: Final answer
    x = 801.58

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1.5x scale

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.