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Finding the Fourth Proportional to 138,718.80, 208,078.20 and 115,390.80

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Solution

The fourth proportional to 138,718.80, 208,078.20 and 115,390.80 is: 173,086.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,718.80 : 208,078.20 = 115,390.80 : x
  2. Step 2: Convert to fraction form
    138,718.80/208,078.20 = 115,390.80/x
  3. Step 3: Cross multiply
    138,718.80x = 208,078.20 × 115,390.80
  4. Step 4: Simplify right side
    138,718.80x = 24,010,309,960.56
  5. Step 5: Solve for x
    x = 24,010,309,960.56/138,718.80
  6. Step 6: Final answer
    x = 173,086.20

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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.