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Finding the Fourth Proportional to 123.39, 171.47 and 122.15

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Solution

The fourth proportional to 123.39, 171.47 and 122.15 is: 169.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.39 : 171.47 = 122.15 : x
  2. Step 2: Convert to fraction form
    123.39/171.47 = 122.15/x
  3. Step 3: Cross multiply
    123.39x = 171.47 × 122.15
  4. Step 4: Simplify right side
    123.39x = 20,943.59
  5. Step 5: Solve for x
    x = 20,943.59/123.39
  6. Step 6: Final answer
    x = 169.73

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.