Home / 100,443.28-138,610.44-55,121.68

Finding the Fourth Proportional to 100,443.28, 138,610.44 and 55,121.68

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Solution

The fourth proportional to 100,443.28, 138,610.44 and 55,121.68 is: 76,067.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,443.28 : 138,610.44 = 55,121.68 : x
  2. Step 2: Convert to fraction form
    100,443.28/138,610.44 = 55,121.68/x
  3. Step 3: Cross multiply
    100,443.28x = 138,610.44 × 55,121.68
  4. Step 4: Simplify right side
    100,443.28x = 7,640,440,318.34
  5. Step 5: Solve for x
    x = 7,640,440,318.34/100,443.28
  6. Step 6: Final answer
    x = 76,067.21

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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.