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Finding the Fourth Proportional to 861.31, 1,189.06 and 691.41

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Solution

The fourth proportional to 861.31, 1,189.06 and 691.41 is: 954.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.31 : 1,189.06 = 691.41 : x
  2. Step 2: Convert to fraction form
    861.31/1,189.06 = 691.41/x
  3. Step 3: Cross multiply
    861.31x = 1,189.06 × 691.41
  4. Step 4: Simplify right side
    861.31x = 822,134.59
  5. Step 5: Solve for x
    x = 822,134.59/861.31
  6. Step 6: Final answer
    x = 954.52

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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.