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Finding the Fourth Proportional to 92.98, 138.61 and 80.20

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Solution

The fourth proportional to 92.98, 138.61 and 80.20 is: 119.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.98 : 138.61 = 80.20 : x
  2. Step 2: Convert to fraction form
    92.98/138.61 = 80.20/x
  3. Step 3: Cross multiply
    92.98x = 138.61 × 80.20
  4. Step 4: Simplify right side
    92.98x = 11,116.52
  5. Step 5: Solve for x
    x = 11,116.52/92.98
  6. Step 6: Final answer
    x = 119.56

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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.