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Finding the Fourth Proportional to 123.03, 169.56 and 91.89

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Solution

The fourth proportional to 123.03, 169.56 and 91.89 is: 126.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.03 : 169.56 = 91.89 : x
  2. Step 2: Convert to fraction form
    123.03/169.56 = 91.89/x
  3. Step 3: Cross multiply
    123.03x = 169.56 × 91.89
  4. Step 4: Simplify right side
    123.03x = 15,580.87
  5. Step 5: Solve for x
    x = 15,580.87/123.03
  6. Step 6: Final answer
    x = 126.64

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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.