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Finding the Fourth Proportional to 159, 238.68 and 82.08

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Solution

The fourth proportional to 159, 238.68 and 82.08 is: 123.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    159 : 238.68 = 82.08 : x
  2. Step 2: Convert to fraction form
    159/238.68 = 82.08/x
  3. Step 3: Cross multiply
    159x = 238.68 × 82.08
  4. Step 4: Simplify right side
    159x = 19,590.85
  5. Step 5: Solve for x
    x = 19,590.85/159
  6. Step 6: Final answer
    x = 123.21

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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.