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Finding the Fourth Proportional to 138.24, 208.20 and 131.52

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Solution

The fourth proportional to 138.24, 208.20 and 131.52 is: 198.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.24 : 208.20 = 131.52 : x
  2. Step 2: Convert to fraction form
    138.24/208.20 = 131.52/x
  3. Step 3: Cross multiply
    138.24x = 208.20 × 131.52
  4. Step 4: Simplify right side
    138.24x = 27,382.46
  5. Step 5: Solve for x
    x = 27,382.46/138.24
  6. Step 6: Final answer
    x = 198.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.