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Finding the Fourth Proportional to 121.13, 166.89 and 113.57

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Solution

The fourth proportional to 121.13, 166.89 and 113.57 is: 156.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.13 : 166.89 = 113.57 : x
  2. Step 2: Convert to fraction form
    121.13/166.89 = 113.57/x
  3. Step 3: Cross multiply
    121.13x = 166.89 × 113.57
  4. Step 4: Simplify right side
    121.13x = 18,953.70
  5. Step 5: Solve for x
    x = 18,953.70/121.13
  6. Step 6: Final answer
    x = 156.47

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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.