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Finding the Fourth Proportional to 121.34, 166.51 and 110.40

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Solution

The fourth proportional to 121.34, 166.51 and 110.40 is: 151.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.34 : 166.51 = 110.40 : x
  2. Step 2: Convert to fraction form
    121.34/166.51 = 110.40/x
  3. Step 3: Cross multiply
    121.34x = 166.51 × 110.40
  4. Step 4: Simplify right side
    121.34x = 18,382.70
  5. Step 5: Solve for x
    x = 18,382.70/121.34
  6. Step 6: Final answer
    x = 151.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.