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Finding the Fourth Proportional to 123.03, 169.70 and 105.75

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Solution

The fourth proportional to 123.03, 169.70 and 105.75 is: 145.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.03 : 169.70 = 105.75 : x
  2. Step 2: Convert to fraction form
    123.03/169.70 = 105.75/x
  3. Step 3: Cross multiply
    123.03x = 169.70 × 105.75
  4. Step 4: Simplify right side
    123.03x = 17,945.25
  5. Step 5: Solve for x
    x = 17,945.25/123.03
  6. Step 6: Final answer
    x = 145.86

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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.