Home / 85,469,199.70-128,203,799.55-76,959,145.30

Finding the Fourth Proportional to 85,469,199.70, 128,203,799.55 and 76,959,145.30

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Solution

The fourth proportional to 85,469,199.70, 128,203,799.55 and 76,959,145.30 is: 115,438,717.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,469,199.70 : 128,203,799.55 = 76,959,145.30 : x
  2. Step 2: Convert to fraction form
    85,469,199.70/128,203,799.55 = 76,959,145.30/x
  3. Step 3: Cross multiply
    85,469,199.70x = 128,203,799.55 × 76,959,145.30
  4. Step 4: Simplify right side
    85,469,199.70x = 9,866,454,837,580,524
  5. Step 5: Solve for x
    x = 9,866,454,837,580,524/85,469,199.70
  6. Step 6: Final answer
    x = 115,438,717.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.