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Finding the Fourth Proportional to 123.96, 171.44 and 109.40

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Solution

The fourth proportional to 123.96, 171.44 and 109.40 is: 151.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.96 : 171.44 = 109.40 : x
  2. Step 2: Convert to fraction form
    123.96/171.44 = 109.40/x
  3. Step 3: Cross multiply
    123.96x = 171.44 × 109.40
  4. Step 4: Simplify right side
    123.96x = 18,755.54
  5. Step 5: Solve for x
    x = 18,755.54/123.96
  6. Step 6: Final answer
    x = 151.30

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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.