Home / 100,680.20-138,939.20-55,361.10

Finding the Fourth Proportional to 100,680.20, 138,939.20 and 55,361.10

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Solution

The fourth proportional to 100,680.20, 138,939.20 and 55,361.10 is: 76,398.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,680.20 : 138,939.20 = 55,361.10 : x
  2. Step 2: Convert to fraction form
    100,680.20/138,939.20 = 55,361.10/x
  3. Step 3: Cross multiply
    100,680.20x = 138,939.20 × 55,361.10
  4. Step 4: Simplify right side
    100,680.20x = 7,691,826,945.12
  5. Step 5: Solve for x
    x = 7,691,826,945.12/100,680.20
  6. Step 6: Final answer
    x = 76,398.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.