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Finding the Fourth Proportional to 138.54, 206.88 and 131.52

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Solution

The fourth proportional to 138.54, 206.88 and 131.52 is: 196.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.54 : 206.88 = 131.52 : x
  2. Step 2: Convert to fraction form
    138.54/206.88 = 131.52/x
  3. Step 3: Cross multiply
    138.54x = 206.88 × 131.52
  4. Step 4: Simplify right side
    138.54x = 27,208.86
  5. Step 5: Solve for x
    x = 27,208.86/138.54
  6. Step 6: Final answer
    x = 196.40

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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.