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Finding the Fourth Proportional to 123.06, 169.68 and 99.68

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Solution

The fourth proportional to 123.06, 169.68 and 99.68 is: 137.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.06 : 169.68 = 99.68 : x
  2. Step 2: Convert to fraction form
    123.06/169.68 = 99.68/x
  3. Step 3: Cross multiply
    123.06x = 169.68 × 99.68
  4. Step 4: Simplify right side
    123.06x = 16,913.70
  5. Step 5: Solve for x
    x = 16,913.70/123.06
  6. Step 6: Final answer
    x = 137.44

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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.