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Finding the Fourth Proportional to 159.61, 220.36 and 122.69

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Solution

The fourth proportional to 159.61, 220.36 and 122.69 is: 169.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.61 : 220.36 = 122.69 : x
  2. Step 2: Convert to fraction form
    159.61/220.36 = 122.69/x
  3. Step 3: Cross multiply
    159.61x = 220.36 × 122.69
  4. Step 4: Simplify right side
    159.61x = 27,036.21
  5. Step 5: Solve for x
    x = 27,036.21/159.61
  6. Step 6: Final answer
    x = 169.39

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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.