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Finding the Fourth Proportional to 83,907.45, 125,713.54 and 78,912.92

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Solution

The fourth proportional to 83,907.45, 125,713.54 and 78,912.92 is: 118,230.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,907.45 : 125,713.54 = 78,912.92 : x
  2. Step 2: Convert to fraction form
    83,907.45/125,713.54 = 78,912.92/x
  3. Step 3: Cross multiply
    83,907.45x = 125,713.54 × 78,912.92
  4. Step 4: Simplify right side
    83,907.45x = 9,920,422,524.94
  5. Step 5: Solve for x
    x = 9,920,422,524.94/83,907.45
  6. Step 6: Final answer
    x = 118,230.53

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1.5x scale

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.