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Finding the Fourth Proportional to 121.79, 182.69 and 40.69

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Solution

The fourth proportional to 121.79, 182.69 and 40.69 is: 61.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.79 : 182.69 = 40.69 : x
  2. Step 2: Convert to fraction form
    121.79/182.69 = 40.69/x
  3. Step 3: Cross multiply
    121.79x = 182.69 × 40.69
  4. Step 4: Simplify right side
    121.79x = 7,432.54
  5. Step 5: Solve for x
    x = 7,432.54/121.79
  6. Step 6: Final answer
    x = 61.03

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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.