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Finding the Fourth Proportional to 139.33, 208.16 and 124.75

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Solution

The fourth proportional to 139.33, 208.16 and 124.75 is: 186.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.33 : 208.16 = 124.75 : x
  2. Step 2: Convert to fraction form
    139.33/208.16 = 124.75/x
  3. Step 3: Cross multiply
    139.33x = 208.16 × 124.75
  4. Step 4: Simplify right side
    139.33x = 25,967.96
  5. Step 5: Solve for x
    x = 25,967.96/139.33
  6. Step 6: Final answer
    x = 186.38

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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.