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Finding the Fourth Proportional to 159.47, 220.07 and 138.81

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Solution

The fourth proportional to 159.47, 220.07 and 138.81 is: 191.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.47 : 220.07 = 138.81 : x
  2. Step 2: Convert to fraction form
    159.47/220.07 = 138.81/x
  3. Step 3: Cross multiply
    159.47x = 220.07 × 138.81
  4. Step 4: Simplify right side
    159.47x = 30,548.31
  5. Step 5: Solve for x
    x = 30,548.31/159.47
  6. Step 6: Final answer
    x = 191.56

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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.