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Finding the Fourth Proportional to 113.38, 169.78 and 104.02

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Solution

The fourth proportional to 113.38, 169.78 and 104.02 is: 155.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.38 : 169.78 = 104.02 : x
  2. Step 2: Convert to fraction form
    113.38/169.78 = 104.02/x
  3. Step 3: Cross multiply
    113.38x = 169.78 × 104.02
  4. Step 4: Simplify right side
    113.38x = 17,660.52
  5. Step 5: Solve for x
    x = 17,660.52/113.38
  6. Step 6: Final answer
    x = 155.76

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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.