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Finding the Fourth Proportional to 159.54, 238.90 and 138.88

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Solution

The fourth proportional to 159.54, 238.90 and 138.88 is: 207.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.54 : 238.90 = 138.88 : x
  2. Step 2: Convert to fraction form
    159.54/238.90 = 138.88/x
  3. Step 3: Cross multiply
    159.54x = 238.90 × 138.88
  4. Step 4: Simplify right side
    159.54x = 33,178.43
  5. Step 5: Solve for x
    x = 33,178.43/159.54
  6. Step 6: Final answer
    x = 207.96

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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.