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Finding the Fourth Proportional to 139.44, 209.11 and 57.18

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Solution

The fourth proportional to 139.44, 209.11 and 57.18 is: 85.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.44 : 209.11 = 57.18 : x
  2. Step 2: Convert to fraction form
    139.44/209.11 = 57.18/x
  3. Step 3: Cross multiply
    139.44x = 209.11 × 57.18
  4. Step 4: Simplify right side
    139.44x = 11,957.27
  5. Step 5: Solve for x
    x = 11,957.27/139.44
  6. Step 6: Final answer
    x = 85.75

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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.