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Finding the Fourth Proportional to 159.78, 220.56 and 113.24

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Solution

The fourth proportional to 159.78, 220.56 and 113.24 is: 156.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.78 : 220.56 = 113.24 : x
  2. Step 2: Convert to fraction form
    159.78/220.56 = 113.24/x
  3. Step 3: Cross multiply
    159.78x = 220.56 × 113.24
  4. Step 4: Simplify right side
    159.78x = 24,976.21
  5. Step 5: Solve for x
    x = 24,976.21/159.78
  6. Step 6: Final answer
    x = 156.32

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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.