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Finding the Fourth Proportional to 88.74, 133.61 and 81.30

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Solution

The fourth proportional to 88.74, 133.61 and 81.30 is: 122.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.74 : 133.61 = 81.30 : x
  2. Step 2: Convert to fraction form
    88.74/133.61 = 81.30/x
  3. Step 3: Cross multiply
    88.74x = 133.61 × 81.30
  4. Step 4: Simplify right side
    88.74x = 10,862.09
  5. Step 5: Solve for x
    x = 10,862.09/88.74
  6. Step 6: Final answer
    x = 122.40

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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.