Home / 138,845.32-191,585.98-78,414.86

Finding the Fourth Proportional to 138,845.32, 191,585.98 and 78,414.86

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Solution

The fourth proportional to 138,845.32, 191,585.98 and 78,414.86 is: 108,200.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,845.32 : 191,585.98 = 78,414.86 : x
  2. Step 2: Convert to fraction form
    138,845.32/191,585.98 = 78,414.86/x
  3. Step 3: Cross multiply
    138,845.32x = 191,585.98 × 78,414.86
  4. Step 4: Simplify right side
    138,845.32x = 15,023,187,799.66
  5. Step 5: Solve for x
    x = 15,023,187,799.66/138,845.32
  6. Step 6: Final answer
    x = 108,200.89

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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.