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Finding the Fourth Proportional to 122.70, 169.44 and 102.21

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Solution

The fourth proportional to 122.70, 169.44 and 102.21 is: 141.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.70 : 169.44 = 102.21 : x
  2. Step 2: Convert to fraction form
    122.70/169.44 = 102.21/x
  3. Step 3: Cross multiply
    122.70x = 169.44 × 102.21
  4. Step 4: Simplify right side
    122.70x = 17,318.46
  5. Step 5: Solve for x
    x = 17,318.46/122.70
  6. Step 6: Final answer
    x = 141.14

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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.