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Finding the Fourth Proportional to 120.95, 166.90 and 71.15

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Solution

The fourth proportional to 120.95, 166.90 and 71.15 is: 98.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.95 : 166.90 = 71.15 : x
  2. Step 2: Convert to fraction form
    120.95/166.90 = 71.15/x
  3. Step 3: Cross multiply
    120.95x = 166.90 × 71.15
  4. Step 4: Simplify right side
    120.95x = 11,874.94
  5. Step 5: Solve for x
    x = 11,874.94/120.95
  6. Step 6: Final answer
    x = 98.18

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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.