Home / 138,481.28-191,122.48-78,065.04

Finding the Fourth Proportional to 138,481.28, 191,122.48 and 78,065.04

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Solution

The fourth proportional to 138,481.28, 191,122.48 and 78,065.04 is: 107,740.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,481.28 : 191,122.48 = 78,065.04 : x
  2. Step 2: Convert to fraction form
    138,481.28/191,122.48 = 78,065.04/x
  3. Step 3: Cross multiply
    138,481.28x = 191,122.48 × 78,065.04
  4. Step 4: Simplify right side
    138,481.28x = 14,919,984,046.10
  5. Step 5: Solve for x
    x = 14,919,984,046.10/138,481.28
  6. Step 6: Final answer
    x = 107,740.08

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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.