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Finding the Fourth Proportional to 139.38, 207.94 and 130.86

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Solution

The fourth proportional to 139.38, 207.94 and 130.86 is: 195.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.38 : 207.94 = 130.86 : x
  2. Step 2: Convert to fraction form
    139.38/207.94 = 130.86/x
  3. Step 3: Cross multiply
    139.38x = 207.94 × 130.86
  4. Step 4: Simplify right side
    139.38x = 27,211.03
  5. Step 5: Solve for x
    x = 27,211.03/139.38
  6. Step 6: Final answer
    x = 195.23

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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.