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Finding the Fourth Proportional to 113.52, 169.93 and 80.98

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Solution

The fourth proportional to 113.52, 169.93 and 80.98 is: 121.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.52 : 169.93 = 80.98 : x
  2. Step 2: Convert to fraction form
    113.52/169.93 = 80.98/x
  3. Step 3: Cross multiply
    113.52x = 169.93 × 80.98
  4. Step 4: Simplify right side
    113.52x = 13,760.93
  5. Step 5: Solve for x
    x = 13,760.93/113.52
  6. Step 6: Final answer
    x = 121.22

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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.