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Finding the Fourth Proportional to 159.06, 238.38 and 86.88

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Solution

The fourth proportional to 159.06, 238.38 and 86.88 is: 130.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.06 : 238.38 = 86.88 : x
  2. Step 2: Convert to fraction form
    159.06/238.38 = 86.88/x
  3. Step 3: Cross multiply
    159.06x = 238.38 × 86.88
  4. Step 4: Simplify right side
    159.06x = 20,710.45
  5. Step 5: Solve for x
    x = 20,710.45/159.06
  6. Step 6: Final answer
    x = 130.21

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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.