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Finding the Fourth Proportional to 159.72, 220.62 and 137.88

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Solution

The fourth proportional to 159.72, 220.62 and 137.88 is: 190.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.72 : 220.62 = 137.88 : x
  2. Step 2: Convert to fraction form
    159.72/220.62 = 137.88/x
  3. Step 3: Cross multiply
    159.72x = 220.62 × 137.88
  4. Step 4: Simplify right side
    159.72x = 30,419.09
  5. Step 5: Solve for x
    x = 30,419.09/159.72
  6. Step 6: Final answer
    x = 190.45

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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.