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Finding the Fourth Proportional to 159.57, 220.13 and 122.66

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Solution

The fourth proportional to 159.57, 220.13 and 122.66 is: 169.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.57 : 220.13 = 122.66 : x
  2. Step 2: Convert to fraction form
    159.57/220.13 = 122.66/x
  3. Step 3: Cross multiply
    159.57x = 220.13 × 122.66
  4. Step 4: Simplify right side
    159.57x = 27,002.00
  5. Step 5: Solve for x
    x = 27,002.00/159.57
  6. Step 6: Final answer
    x = 169.22

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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.