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Finding the Fourth Proportional to 159.20, 238.48 and 120.72

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Solution

The fourth proportional to 159.20, 238.48 and 120.72 is: 180.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.20 : 238.48 = 120.72 : x
  2. Step 2: Convert to fraction form
    159.20/238.48 = 120.72/x
  3. Step 3: Cross multiply
    159.20x = 238.48 × 120.72
  4. Step 4: Simplify right side
    159.20x = 28,789.31
  5. Step 5: Solve for x
    x = 28,789.31/159.20
  6. Step 6: Final answer
    x = 180.84

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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.