Home / 5,120.43-7,680.27-1,999.85

Finding the Fourth Proportional to 5,120.43, 7,680.27 and 1,999.85

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Solution

The fourth proportional to 5,120.43, 7,680.27 and 1,999.85 is: 2,999.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.43 : 7,680.27 = 1,999.85 : x
  2. Step 2: Convert to fraction form
    5,120.43/7,680.27 = 1,999.85/x
  3. Step 3: Cross multiply
    5,120.43x = 7,680.27 × 1,999.85
  4. Step 4: Simplify right side
    5,120.43x = 15,359,349.56
  5. Step 5: Solve for x
    x = 15,359,349.56/5,120.43
  6. Step 6: Final answer
    x = 2,999.62

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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.