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Finding the Fourth Proportional to 121.52, 183.20 and 113.69

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Solution

The fourth proportional to 121.52, 183.20 and 113.69 is: 171.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.52 : 183.20 = 113.69 : x
  2. Step 2: Convert to fraction form
    121.52/183.20 = 113.69/x
  3. Step 3: Cross multiply
    121.52x = 183.20 × 113.69
  4. Step 4: Simplify right side
    121.52x = 20,827.90
  5. Step 5: Solve for x
    x = 20,827.90/121.52
  6. Step 6: Final answer
    x = 171.39

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.