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Finding the Fourth Proportional to 138.88, 191.58 and 80.62

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Solution

The fourth proportional to 138.88, 191.58 and 80.62 is: 111.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.88 : 191.58 = 80.62 : x
  2. Step 2: Convert to fraction form
    138.88/191.58 = 80.62/x
  3. Step 3: Cross multiply
    138.88x = 191.58 × 80.62
  4. Step 4: Simplify right side
    138.88x = 15,445.18
  5. Step 5: Solve for x
    x = 15,445.18/138.88
  6. Step 6: Final answer
    x = 111.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.