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Finding the Fourth Proportional to 139.80, 208.47 and 124.41

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Solution

The fourth proportional to 139.80, 208.47 and 124.41 is: 185.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.80 : 208.47 = 124.41 : x
  2. Step 2: Convert to fraction form
    139.80/208.47 = 124.41/x
  3. Step 3: Cross multiply
    139.80x = 208.47 × 124.41
  4. Step 4: Simplify right side
    139.80x = 25,935.75
  5. Step 5: Solve for x
    x = 25,935.75/139.80
  6. Step 6: Final answer
    x = 185.52

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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.