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Finding the Fourth Proportional to 88.75, 132.32 and 87.13

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Solution

The fourth proportional to 88.75, 132.32 and 87.13 is: 129.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.75 : 132.32 = 87.13 : x
  2. Step 2: Convert to fraction form
    88.75/132.32 = 87.13/x
  3. Step 3: Cross multiply
    88.75x = 132.32 × 87.13
  4. Step 4: Simplify right side
    88.75x = 11,528.49
  5. Step 5: Solve for x
    x = 11,528.49/88.75
  6. Step 6: Final answer
    x = 129.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.