Home / 138,620.28-191,291.68-78,190.04

Finding the Fourth Proportional to 138,620.28, 191,291.68 and 78,190.04

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Solution

The fourth proportional to 138,620.28, 191,291.68 and 78,190.04 is: 107,899.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,620.28 : 191,291.68 = 78,190.04 : x
  2. Step 2: Convert to fraction form
    138,620.28/191,291.68 = 78,190.04/x
  3. Step 3: Cross multiply
    138,620.28x = 191,291.68 × 78,190.04
  4. Step 4: Simplify right side
    138,620.28x = 14,957,104,110.87
  5. Step 5: Solve for x
    x = 14,957,104,110.87/138,620.28
  6. Step 6: Final answer
    x = 107,899.83

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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.