Home / 85,469,132.20-128,203,698.30-76,959,077.80

Finding the Fourth Proportional to 85,469,132.20, 128,203,698.30 and 76,959,077.80

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Solution

The fourth proportional to 85,469,132.20, 128,203,698.30 and 76,959,077.80 is: 115,438,616.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,469,132.20 : 128,203,698.30 = 76,959,077.80 : x
  2. Step 2: Convert to fraction form
    85,469,132.20/128,203,698.30 = 76,959,077.80/x
  3. Step 3: Cross multiply
    85,469,132.20x = 128,203,698.30 × 76,959,077.80
  4. Step 4: Simplify right side
    85,469,132.20x = 9,866,438,391,717,428
  5. Step 5: Solve for x
    x = 9,866,438,391,717,428/85,469,132.20
  6. Step 6: Final answer
    x = 115,438,616.70

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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.