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Finding the Fourth Proportional to 139,640.20, 209,460.30 and 136,359.70

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Solution

The fourth proportional to 139,640.20, 209,460.30 and 136,359.70 is: 204,539.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,640.20 : 209,460.30 = 136,359.70 : x
  2. Step 2: Convert to fraction form
    139,640.20/209,460.30 = 136,359.70/x
  3. Step 3: Cross multiply
    139,640.20x = 209,460.30 × 136,359.70
  4. Step 4: Simplify right side
    139,640.20x = 28,561,943,669.91
  5. Step 5: Solve for x
    x = 28,561,943,669.91/139,640.20
  6. Step 6: Final answer
    x = 204,539.55

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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.