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Finding the Fourth Proportional to 139.32, 209.08 and 119.07

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Solution

The fourth proportional to 139.32, 209.08 and 119.07 is: 178.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.32 : 209.08 = 119.07 : x
  2. Step 2: Convert to fraction form
    139.32/209.08 = 119.07/x
  3. Step 3: Cross multiply
    139.32x = 209.08 × 119.07
  4. Step 4: Simplify right side
    139.32x = 24,895.30
  5. Step 5: Solve for x
    x = 24,895.30/139.32
  6. Step 6: Final answer
    x = 178.69

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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.