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Finding the Fourth Proportional to 121.55, 167.64 and 84.71

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Solution

The fourth proportional to 121.55, 167.64 and 84.71 is: 116.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.55 : 167.64 = 84.71 : x
  2. Step 2: Convert to fraction form
    121.55/167.64 = 84.71/x
  3. Step 3: Cross multiply
    121.55x = 167.64 × 84.71
  4. Step 4: Simplify right side
    121.55x = 14,200.78
  5. Step 5: Solve for x
    x = 14,200.78/121.55
  6. Step 6: Final answer
    x = 116.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.