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Finding the Fourth Proportional to 121.78, 182.50 and 67.56

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Solution

The fourth proportional to 121.78, 182.50 and 67.56 is: 101.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.78 : 182.50 = 67.56 : x
  2. Step 2: Convert to fraction form
    121.78/182.50 = 67.56/x
  3. Step 3: Cross multiply
    121.78x = 182.50 × 67.56
  4. Step 4: Simplify right side
    121.78x = 12,329.70
  5. Step 5: Solve for x
    x = 12,329.70/121.78
  6. Step 6: Final answer
    x = 101.25

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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.