Home / 8,391.60-12,579.40-3,125.20

Finding the Fourth Proportional to 8,391.60, 12,579.40 and 3,125.20

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Solution

The fourth proportional to 8,391.60, 12,579.40 and 3,125.20 is: 4,684.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.60 : 12,579.40 = 3,125.20 : x
  2. Step 2: Convert to fraction form
    8,391.60/12,579.40 = 3,125.20/x
  3. Step 3: Cross multiply
    8,391.60x = 12,579.40 × 3,125.20
  4. Step 4: Simplify right side
    8,391.60x = 39,313,140.88
  5. Step 5: Solve for x
    x = 39,313,140.88/8,391.60
  6. Step 6: Final answer
    x = 4,684.82

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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.