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Finding the Fourth Proportional to 121.62, 182.43 and 115.47

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Solution

The fourth proportional to 121.62, 182.43 and 115.47 is: 173.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.62 : 182.43 = 115.47 : x
  2. Step 2: Convert to fraction form
    121.62/182.43 = 115.47/x
  3. Step 3: Cross multiply
    121.62x = 182.43 × 115.47
  4. Step 4: Simplify right side
    121.62x = 21,065.19
  5. Step 5: Solve for x
    x = 21,065.19/121.62
  6. Step 6: Final answer
    x = 173.21

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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.