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Finding the Fourth Proportional to 139.82, 209.48 and 130.62

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Solution

The fourth proportional to 139.82, 209.48 and 130.62 is: 195.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.82 : 209.48 = 130.62 : x
  2. Step 2: Convert to fraction form
    139.82/209.48 = 130.62/x
  3. Step 3: Cross multiply
    139.82x = 209.48 × 130.62
  4. Step 4: Simplify right side
    139.82x = 27,362.28
  5. Step 5: Solve for x
    x = 27,362.28/139.82
  6. Step 6: Final answer
    x = 195.70

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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.