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Finding the Fourth Proportional to 123, 183.68 and 100.13

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Solution

The fourth proportional to 123, 183.68 and 100.13 is: 149.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    123 : 183.68 = 100.13 : x
  2. Step 2: Convert to fraction form
    123/183.68 = 100.13/x
  3. Step 3: Cross multiply
    123x = 183.68 × 100.13
  4. Step 4: Simplify right side
    123x = 18,390.46
  5. Step 5: Solve for x
    x = 18,390.46/123
  6. Step 6: Final answer
    x = 149.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.