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Finding the Fourth Proportional to 90.11, 135.17 and 38.74

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Solution

The fourth proportional to 90.11, 135.17 and 38.74 is: 58.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.11 : 135.17 = 38.74 : x
  2. Step 2: Convert to fraction form
    90.11/135.17 = 38.74/x
  3. Step 3: Cross multiply
    90.11x = 135.17 × 38.74
  4. Step 4: Simplify right side
    90.11x = 5,236.49
  5. Step 5: Solve for x
    x = 5,236.49/90.11
  6. Step 6: Final answer
    x = 58.11

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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.