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Finding the Fourth Proportional to 94.50, 141.21 and 71.55

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Solution

The fourth proportional to 94.50, 141.21 and 71.55 is: 106.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.50 : 141.21 = 71.55 : x
  2. Step 2: Convert to fraction form
    94.50/141.21 = 71.55/x
  3. Step 3: Cross multiply
    94.50x = 141.21 × 71.55
  4. Step 4: Simplify right side
    94.50x = 10,103.58
  5. Step 5: Solve for x
    x = 10,103.58/94.50
  6. Step 6: Final answer
    x = 106.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.