Home / 3,899.90-5,381.61-2,131.40

Finding the Fourth Proportional to 3,899.90, 5,381.61 and 2,131.40

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Solution

The fourth proportional to 3,899.90, 5,381.61 and 2,131.40 is: 2,941.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.90 : 5,381.61 = 2,131.40 : x
  2. Step 2: Convert to fraction form
    3,899.90/5,381.61 = 2,131.40/x
  3. Step 3: Cross multiply
    3,899.90x = 5,381.61 × 2,131.40
  4. Step 4: Simplify right side
    3,899.90x = 11,470,336.65
  5. Step 5: Solve for x
    x = 11,470,336.65/3,899.90
  6. Step 6: Final answer
    x = 2,941.19

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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.