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Finding the Fourth Proportional to 139,687.20, 209,530.80 and 127,221.30

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Solution

The fourth proportional to 139,687.20, 209,530.80 and 127,221.30 is: 190,831.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,687.20 : 209,530.80 = 127,221.30 : x
  2. Step 2: Convert to fraction form
    139,687.20/209,530.80 = 127,221.30/x
  3. Step 3: Cross multiply
    139,687.20x = 209,530.80 × 127,221.30
  4. Step 4: Simplify right side
    139,687.20x = 26,656,780,766.04
  5. Step 5: Solve for x
    x = 26,656,780,766.04/139,687.20
  6. Step 6: Final answer
    x = 190,831.95

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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.