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Finding the Fourth Proportional to 139.05, 207.54 and 124.47

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Solution

The fourth proportional to 139.05, 207.54 and 124.47 is: 185.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.05 : 207.54 = 124.47 : x
  2. Step 2: Convert to fraction form
    139.05/207.54 = 124.47/x
  3. Step 3: Cross multiply
    139.05x = 207.54 × 124.47
  4. Step 4: Simplify right side
    139.05x = 25,832.50
  5. Step 5: Solve for x
    x = 25,832.50/139.05
  6. Step 6: Final answer
    x = 185.78

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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.