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Finding the Fourth Proportional to 123.04, 169.66 and 100.85

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Solution

The fourth proportional to 123.04, 169.66 and 100.85 is: 139.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.04 : 169.66 = 100.85 : x
  2. Step 2: Convert to fraction form
    123.04/169.66 = 100.85/x
  3. Step 3: Cross multiply
    123.04x = 169.66 × 100.85
  4. Step 4: Simplify right side
    123.04x = 17,109.46
  5. Step 5: Solve for x
    x = 17,109.46/123.04
  6. Step 6: Final answer
    x = 139.05

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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.