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Finding the Fourth Proportional to 87.74, 132.09 and 68.59

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Solution

The fourth proportional to 87.74, 132.09 and 68.59 is: 103.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.74 : 132.09 = 68.59 : x
  2. Step 2: Convert to fraction form
    87.74/132.09 = 68.59/x
  3. Step 3: Cross multiply
    87.74x = 132.09 × 68.59
  4. Step 4: Simplify right side
    87.74x = 9,059.72
  5. Step 5: Solve for x
    x = 9,059.72/87.74
  6. Step 6: Final answer
    x = 103.26

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.