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Finding the Fourth Proportional to 159.78, 220.02 and 137.49

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Solution

The fourth proportional to 159.78, 220.02 and 137.49 is: 189.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.78 : 220.02 = 137.49 : x
  2. Step 2: Convert to fraction form
    159.78/220.02 = 137.49/x
  3. Step 3: Cross multiply
    159.78x = 220.02 × 137.49
  4. Step 4: Simplify right side
    159.78x = 30,250.55
  5. Step 5: Solve for x
    x = 30,250.55/159.78
  6. Step 6: Final answer
    x = 189.33

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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.