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Finding the Fourth Proportional to 139.14, 207.69 and 123.89

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Solution

The fourth proportional to 139.14, 207.69 and 123.89 is: 184.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.14 : 207.69 = 123.89 : x
  2. Step 2: Convert to fraction form
    139.14/207.69 = 123.89/x
  3. Step 3: Cross multiply
    139.14x = 207.69 × 123.89
  4. Step 4: Simplify right side
    139.14x = 25,729.68
  5. Step 5: Solve for x
    x = 25,729.68/139.14
  6. Step 6: Final answer
    x = 184.92

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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.