Home / 138,780.11-191,517.14-82,187.84

Finding the Fourth Proportional to 138,780.11, 191,517.14 and 82,187.84

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Solution

The fourth proportional to 138,780.11, 191,517.14 and 82,187.84 is: 113,419.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,780.11 : 191,517.14 = 82,187.84 : x
  2. Step 2: Convert to fraction form
    138,780.11/191,517.14 = 82,187.84/x
  3. Step 3: Cross multiply
    138,780.11x = 191,517.14 × 82,187.84
  4. Step 4: Simplify right side
    138,780.11x = 15,740,380,059.58
  5. Step 5: Solve for x
    x = 15,740,380,059.58/138,780.11
  6. Step 6: Final answer
    x = 113,419.57

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1.5x scale

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.