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Finding the Fourth Proportional to 121.74, 182.42 and 85.60

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Solution

The fourth proportional to 121.74, 182.42 and 85.60 is: 128.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.74 : 182.42 = 85.60 : x
  2. Step 2: Convert to fraction form
    121.74/182.42 = 85.60/x
  3. Step 3: Cross multiply
    121.74x = 182.42 × 85.60
  4. Step 4: Simplify right side
    121.74x = 15,615.15
  5. Step 5: Solve for x
    x = 15,615.15/121.74
  6. Step 6: Final answer
    x = 128.27

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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.