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Finding the Fourth Proportional to 88.69, 132.50 and 86.89

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Solution

The fourth proportional to 88.69, 132.50 and 86.89 is: 129.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.69 : 132.50 = 86.89 : x
  2. Step 2: Convert to fraction form
    88.69/132.50 = 86.89/x
  3. Step 3: Cross multiply
    88.69x = 132.50 × 86.89
  4. Step 4: Simplify right side
    88.69x = 11,512.93
  5. Step 5: Solve for x
    x = 11,512.93/88.69
  6. Step 6: Final answer
    x = 129.81

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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.