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Finding the Fourth Proportional to 89.78, 134.72 and 38.43

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Solution

The fourth proportional to 89.78, 134.72 and 38.43 is: 57.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.78 : 134.72 = 38.43 : x
  2. Step 2: Convert to fraction form
    89.78/134.72 = 38.43/x
  3. Step 3: Cross multiply
    89.78x = 134.72 × 38.43
  4. Step 4: Simplify right side
    89.78x = 5,177.91
  5. Step 5: Solve for x
    x = 5,177.91/89.78
  6. Step 6: Final answer
    x = 57.68

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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.