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Finding the Fourth Proportional to 138.74, 207.35 and 119.60

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Solution

The fourth proportional to 138.74, 207.35 and 119.60 is: 178.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.74 : 207.35 = 119.60 : x
  2. Step 2: Convert to fraction form
    138.74/207.35 = 119.60/x
  3. Step 3: Cross multiply
    138.74x = 207.35 × 119.60
  4. Step 4: Simplify right side
    138.74x = 24,799.06
  5. Step 5: Solve for x
    x = 24,799.06/138.74
  6. Step 6: Final answer
    x = 178.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.