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Finding the Fourth Proportional to 88.61, 133.20 and 86.76

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Solution

The fourth proportional to 88.61, 133.20 and 86.76 is: 130.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.61 : 133.20 = 86.76 : x
  2. Step 2: Convert to fraction form
    88.61/133.20 = 86.76/x
  3. Step 3: Cross multiply
    88.61x = 133.20 × 86.76
  4. Step 4: Simplify right side
    88.61x = 11,556.43
  5. Step 5: Solve for x
    x = 11,556.43/88.61
  6. Step 6: Final answer
    x = 130.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.