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Finding the Fourth Proportional to 139.24, 208.62 and 125.68

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Solution

The fourth proportional to 139.24, 208.62 and 125.68 is: 188.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.24 : 208.62 = 125.68 : x
  2. Step 2: Convert to fraction form
    139.24/208.62 = 125.68/x
  3. Step 3: Cross multiply
    139.24x = 208.62 × 125.68
  4. Step 4: Simplify right side
    139.24x = 26,219.36
  5. Step 5: Solve for x
    x = 26,219.36/139.24
  6. Step 6: Final answer
    x = 188.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.