Home / 85,469,187.70-128,203,781.55-76,959,133.30

Finding the Fourth Proportional to 85,469,187.70, 128,203,781.55 and 76,959,133.30

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Solution

The fourth proportional to 85,469,187.70, 128,203,781.55 and 76,959,133.30 is: 115,438,699.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,469,187.70 : 128,203,781.55 = 76,959,133.30 : x
  2. Step 2: Convert to fraction form
    85,469,187.70/128,203,781.55 = 76,959,133.30/x
  3. Step 3: Cross multiply
    85,469,187.70x = 128,203,781.55 × 76,959,133.30
  4. Step 4: Simplify right side
    85,469,187.70x = 9,866,451,913,870,530
  5. Step 5: Solve for x
    x = 9,866,451,913,870,530/85,469,187.70
  6. Step 6: Final answer
    x = 115,438,699.95

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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.