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Finding the Fourth Proportional to 159.36, 220 and 115.76

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Solution

The fourth proportional to 159.36, 220 and 115.76 is: 159.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.36 : 220 = 115.76 : x
  2. Step 2: Convert to fraction form
    159.36/220 = 115.76/x
  3. Step 3: Cross multiply
    159.36x = 220 × 115.76
  4. Step 4: Simplify right side
    159.36x = 25,467.20
  5. Step 5: Solve for x
    x = 25,467.20/159.36
  6. Step 6: Final answer
    x = 159.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.