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Finding the Fourth Proportional to 123.13, 169.93 and 121.71

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Solution

The fourth proportional to 123.13, 169.93 and 121.71 is: 167.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.13 : 169.93 = 121.71 : x
  2. Step 2: Convert to fraction form
    123.13/169.93 = 121.71/x
  3. Step 3: Cross multiply
    123.13x = 169.93 × 121.71
  4. Step 4: Simplify right side
    123.13x = 20,682.18
  5. Step 5: Solve for x
    x = 20,682.18/123.13
  6. Step 6: Final answer
    x = 167.97

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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.