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Finding the Fourth Proportional to 122.72, 168.91 and 101.76

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Solution

The fourth proportional to 122.72, 168.91 and 101.76 is: 140.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.72 : 168.91 = 101.76 : x
  2. Step 2: Convert to fraction form
    122.72/168.91 = 101.76/x
  3. Step 3: Cross multiply
    122.72x = 168.91 × 101.76
  4. Step 4: Simplify right side
    122.72x = 17,186.93
  5. Step 5: Solve for x
    x = 17,186.93/122.72
  6. Step 6: Final answer
    x = 140.06

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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.