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Finding the Fourth Proportional to 138.36, 207.68 and 130.71

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Solution

The fourth proportional to 138.36, 207.68 and 130.71 is: 196.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.36 : 207.68 = 130.71 : x
  2. Step 2: Convert to fraction form
    138.36/207.68 = 130.71/x
  3. Step 3: Cross multiply
    138.36x = 207.68 × 130.71
  4. Step 4: Simplify right side
    138.36x = 27,145.20
  5. Step 5: Solve for x
    x = 27,145.20/138.36
  6. Step 6: Final answer
    x = 196.19

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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.