Home / 100,239.11-138,329.89-54,919.91

Finding the Fourth Proportional to 100,239.11, 138,329.89 and 54,919.91

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Solution

The fourth proportional to 100,239.11, 138,329.89 and 54,919.91 is: 75,789.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,239.11 : 138,329.89 = 54,919.91 : x
  2. Step 2: Convert to fraction form
    100,239.11/138,329.89 = 54,919.91/x
  3. Step 3: Cross multiply
    100,239.11x = 138,329.89 × 54,919.91
  4. Step 4: Simplify right side
    100,239.11x = 7,597,065,109.11
  5. Step 5: Solve for x
    x = 7,597,065,109.11/100,239.11
  6. Step 6: Final answer
    x = 75,789.43

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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.