Home / 3,900.05-5,382.08-2,131.65

Finding the Fourth Proportional to 3,900.05, 5,382.08 and 2,131.65

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Solution

The fourth proportional to 3,900.05, 5,382.08 and 2,131.65 is: 2,941.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.05 : 5,382.08 = 2,131.65 : x
  2. Step 2: Convert to fraction form
    3,900.05/5,382.08 = 2,131.65/x
  3. Step 3: Cross multiply
    3,900.05x = 5,382.08 × 2,131.65
  4. Step 4: Simplify right side
    3,900.05x = 11,472,700.17
  5. Step 5: Solve for x
    x = 11,472,700.17/3,900.05
  6. Step 6: Final answer
    x = 2,941.68

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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.