Home / 128,752,979.70-193,129,469.55-87,938,310.90

Finding the Fourth Proportional to 128,752,979.70, 193,129,469.55 and 87,938,310.90

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Solution

The fourth proportional to 128,752,979.70, 193,129,469.55 and 87,938,310.90 is: 131,907,466.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,752,979.70 : 193,129,469.55 = 87,938,310.90 : x
  2. Step 2: Convert to fraction form
    128,752,979.70/193,129,469.55 = 87,938,310.90/x
  3. Step 3: Cross multiply
    128,752,979.70x = 193,129,469.55 × 87,938,310.90
  4. Step 4: Simplify right side
    128,752,979.70x = 16,983,479,337,239,986
  5. Step 5: Solve for x
    x = 16,983,479,337,239,986/128,752,979.70
  6. Step 6: Final answer
    x = 131,907,466.35

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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.