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Finding the Fourth Proportional to 861.64, 1,186.26 and 685.96

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Solution

The fourth proportional to 861.64, 1,186.26 and 685.96 is: 944.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.64 : 1,186.26 = 685.96 : x
  2. Step 2: Convert to fraction form
    861.64/1,186.26 = 685.96/x
  3. Step 3: Cross multiply
    861.64x = 1,186.26 × 685.96
  4. Step 4: Simplify right side
    861.64x = 813,726.91
  5. Step 5: Solve for x
    x = 813,726.91/861.64
  6. Step 6: Final answer
    x = 944.39

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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.