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Finding the Fourth Proportional to 138.74, 207.59 and 113.13

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Solution

The fourth proportional to 138.74, 207.59 and 113.13 is: 169.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.74 : 207.59 = 113.13 : x
  2. Step 2: Convert to fraction form
    138.74/207.59 = 113.13/x
  3. Step 3: Cross multiply
    138.74x = 207.59 × 113.13
  4. Step 4: Simplify right side
    138.74x = 23,484.09
  5. Step 5: Solve for x
    x = 23,484.09/138.74
  6. Step 6: Final answer
    x = 169.27

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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.