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Finding the Fourth Proportional to 121.57, 182.20 and 81.02

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Solution

The fourth proportional to 121.57, 182.20 and 81.02 is: 121.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.57 : 182.20 = 81.02 : x
  2. Step 2: Convert to fraction form
    121.57/182.20 = 81.02/x
  3. Step 3: Cross multiply
    121.57x = 182.20 × 81.02
  4. Step 4: Simplify right side
    121.57x = 14,761.84
  5. Step 5: Solve for x
    x = 14,761.84/121.57
  6. Step 6: Final answer
    x = 121.43

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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.