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Finding the Fourth Proportional to 125.16, 171.92 and 121.52

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Solution

The fourth proportional to 125.16, 171.92 and 121.52 is: 166.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.16 : 171.92 = 121.52 : x
  2. Step 2: Convert to fraction form
    125.16/171.92 = 121.52/x
  3. Step 3: Cross multiply
    125.16x = 171.92 × 121.52
  4. Step 4: Simplify right side
    125.16x = 20,891.72
  5. Step 5: Solve for x
    x = 20,891.72/125.16
  6. Step 6: Final answer
    x = 166.92

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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.