Home / 8,319.86-12,481.65-3,125.78

Finding the Fourth Proportional to 8,319.86, 12,481.65 and 3,125.78

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Solution

The fourth proportional to 8,319.86, 12,481.65 and 3,125.78 is: 4,689.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,319.86 : 12,481.65 = 3,125.78 : x
  2. Step 2: Convert to fraction form
    8,319.86/12,481.65 = 3,125.78/x
  3. Step 3: Cross multiply
    8,319.86x = 12,481.65 × 3,125.78
  4. Step 4: Simplify right side
    8,319.86x = 39,014,891.94
  5. Step 5: Solve for x
    x = 39,014,891.94/8,319.86
  6. Step 6: Final answer
    x = 4,689.37

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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.