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Finding the Fourth Proportional to 121.32, 167.41 and 66.05

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Solution

The fourth proportional to 121.32, 167.41 and 66.05 is: 91.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.32 : 167.41 = 66.05 : x
  2. Step 2: Convert to fraction form
    121.32/167.41 = 66.05/x
  3. Step 3: Cross multiply
    121.32x = 167.41 × 66.05
  4. Step 4: Simplify right side
    121.32x = 11,057.77
  5. Step 5: Solve for x
    x = 11,057.77/121.32
  6. Step 6: Final answer
    x = 91.15

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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.