Home / 4,120.89-5,687.28-3,991.65

Finding the Fourth Proportional to 4,120.89, 5,687.28 and 3,991.65

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Solution

The fourth proportional to 4,120.89, 5,687.28 and 3,991.65 is: 5,508.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,120.89 : 5,687.28 = 3,991.65 : x
  2. Step 2: Convert to fraction form
    4,120.89/5,687.28 = 3,991.65/x
  3. Step 3: Cross multiply
    4,120.89x = 5,687.28 × 3,991.65
  4. Step 4: Simplify right side
    4,120.89x = 22,701,631.21
  5. Step 5: Solve for x
    x = 22,701,631.21/4,120.89
  6. Step 6: Final answer
    x = 5,508.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.