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Finding the Fourth Proportional to 159.44, 220.06 and 128.56

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Solution

The fourth proportional to 159.44, 220.06 and 128.56 is: 177.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.44 : 220.06 = 128.56 : x
  2. Step 2: Convert to fraction form
    159.44/220.06 = 128.56/x
  3. Step 3: Cross multiply
    159.44x = 220.06 × 128.56
  4. Step 4: Simplify right side
    159.44x = 28,290.91
  5. Step 5: Solve for x
    x = 28,290.91/159.44
  6. Step 6: Final answer
    x = 177.44

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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.