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Finding the Fourth Proportional to 89.39, 134.28 and 72.48

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Solution

The fourth proportional to 89.39, 134.28 and 72.48 is: 108.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.39 : 134.28 = 72.48 : x
  2. Step 2: Convert to fraction form
    89.39/134.28 = 72.48/x
  3. Step 3: Cross multiply
    89.39x = 134.28 × 72.48
  4. Step 4: Simplify right side
    89.39x = 9,732.61
  5. Step 5: Solve for x
    x = 9,732.61/89.39
  6. Step 6: Final answer
    x = 108.88

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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.