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Finding the Fourth Proportional to 159, 238.62 and 86.88

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Solution

The fourth proportional to 159, 238.62 and 86.88 is: 130.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    159 : 238.62 = 86.88 : x
  2. Step 2: Convert to fraction form
    159/238.62 = 86.88/x
  3. Step 3: Cross multiply
    159x = 238.62 × 86.88
  4. Step 4: Simplify right side
    159x = 20,731.31
  5. Step 5: Solve for x
    x = 20,731.31/159
  6. Step 6: Final answer
    x = 130.39

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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.