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Finding the Fourth Proportional to 139.79, 208.60 and 124.45

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Solution

The fourth proportional to 139.79, 208.60 and 124.45 is: 185.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.79 : 208.60 = 124.45 : x
  2. Step 2: Convert to fraction form
    139.79/208.60 = 124.45/x
  3. Step 3: Cross multiply
    139.79x = 208.60 × 124.45
  4. Step 4: Simplify right side
    139.79x = 25,958.60
  5. Step 5: Solve for x
    x = 25,958.60/139.79
  6. Step 6: Final answer
    x = 185.70

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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.