Home / 138,770.70-191,504.25-78,343.80

Finding the Fourth Proportional to 138,770.70, 191,504.25 and 78,343.80

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Solution

The fourth proportional to 138,770.70, 191,504.25 and 78,343.80 is: 108,114.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,770.70 : 191,504.25 = 78,343.80 : x
  2. Step 2: Convert to fraction form
    138,770.70/191,504.25 = 78,343.80/x
  3. Step 3: Cross multiply
    138,770.70x = 191,504.25 × 78,343.80
  4. Step 4: Simplify right side
    138,770.70x = 15,003,170,661.15
  5. Step 5: Solve for x
    x = 15,003,170,661.15/138,770.70
  6. Step 6: Final answer
    x = 108,114.83

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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.