Home / 87,839.18-121,422.37-78,372.89

Finding the Fourth Proportional to 87,839.18, 121,422.37 and 78,372.89

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Solution

The fourth proportional to 87,839.18, 121,422.37 and 78,372.89 is: 108,336.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,839.18 : 121,422.37 = 78,372.89 : x
  2. Step 2: Convert to fraction form
    87,839.18/121,422.37 = 78,372.89/x
  3. Step 3: Cross multiply
    87,839.18x = 121,422.37 × 78,372.89
  4. Step 4: Simplify right side
    87,839.18x = 9,516,222,155.17
  5. Step 5: Solve for x
    x = 9,516,222,155.17/87,839.18
  6. Step 6: Final answer
    x = 108,336.87

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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.