Home / 138,769.20-191,502.18-78,342.30

Finding the Fourth Proportional to 138,769.20, 191,502.18 and 78,342.30

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Solution

The fourth proportional to 138,769.20, 191,502.18 and 78,342.30 is: 108,112.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,769.20 : 191,502.18 = 78,342.30 : x
  2. Step 2: Convert to fraction form
    138,769.20/191,502.18 = 78,342.30/x
  3. Step 3: Cross multiply
    138,769.20x = 191,502.18 × 78,342.30
  4. Step 4: Simplify right side
    138,769.20x = 15,002,721,236.21
  5. Step 5: Solve for x
    x = 15,002,721,236.21/138,769.20
  6. Step 6: Final answer
    x = 108,112.76

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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.