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Finding the Fourth Proportional to 121.52, 182.39 and 49.39

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Solution

The fourth proportional to 121.52, 182.39 and 49.39 is: 74.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.52 : 182.39 = 49.39 : x
  2. Step 2: Convert to fraction form
    121.52/182.39 = 49.39/x
  3. Step 3: Cross multiply
    121.52x = 182.39 × 49.39
  4. Step 4: Simplify right side
    121.52x = 9,007.54
  5. Step 5: Solve for x
    x = 9,007.54/121.52
  6. Step 6: Final answer
    x = 74.12

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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.