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Finding the Fourth Proportional to 121.47, 182.20 and 89.16

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Solution

The fourth proportional to 121.47, 182.20 and 89.16 is: 133.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.47 : 182.20 = 89.16 : x
  2. Step 2: Convert to fraction form
    121.47/182.20 = 89.16/x
  3. Step 3: Cross multiply
    121.47x = 182.20 × 89.16
  4. Step 4: Simplify right side
    121.47x = 16,244.95
  5. Step 5: Solve for x
    x = 16,244.95/121.47
  6. Step 6: Final answer
    x = 133.74

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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.