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Finding the Fourth Proportional to 138,620.76, 206,928.44 and 121,805.57

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Solution

The fourth proportional to 138,620.76, 206,928.44 and 121,805.57 is: 181,827.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,620.76 : 206,928.44 = 121,805.57 : x
  2. Step 2: Convert to fraction form
    138,620.76/206,928.44 = 121,805.57/x
  3. Step 3: Cross multiply
    138,620.76x = 206,928.44 × 121,805.57
  4. Step 4: Simplify right side
    138,620.76x = 25,205,034,939.74
  5. Step 5: Solve for x
    x = 25,205,034,939.74/138,620.76
  6. Step 6: Final answer
    x = 181,827.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.