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Finding the Fourth Proportional to 139.24, 207.97 and 123.96

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Solution

The fourth proportional to 139.24, 207.97 and 123.96 is: 185.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.24 : 207.97 = 123.96 : x
  2. Step 2: Convert to fraction form
    139.24/207.97 = 123.96/x
  3. Step 3: Cross multiply
    139.24x = 207.97 × 123.96
  4. Step 4: Simplify right side
    139.24x = 25,779.96
  5. Step 5: Solve for x
    x = 25,779.96/139.24
  6. Step 6: Final answer
    x = 185.15

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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.