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Finding the Fourth Proportional to 139.30, 208.70 and 119.94

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Solution

The fourth proportional to 139.30, 208.70 and 119.94 is: 179.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.30 : 208.70 = 119.94 : x
  2. Step 2: Convert to fraction form
    139.30/208.70 = 119.94/x
  3. Step 3: Cross multiply
    139.30x = 208.70 × 119.94
  4. Step 4: Simplify right side
    139.30x = 25,031.48
  5. Step 5: Solve for x
    x = 25,031.48/139.30
  6. Step 6: Final answer
    x = 179.69

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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.