Home / 2,805.90-3,872.43-1,687.20

Finding the Fourth Proportional to 2,805.90, 3,872.43 and 1,687.20

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Solution

The fourth proportional to 2,805.90, 3,872.43 and 1,687.20 is: 2,328.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,805.90 : 3,872.43 = 1,687.20 : x
  2. Step 2: Convert to fraction form
    2,805.90/3,872.43 = 1,687.20/x
  3. Step 3: Cross multiply
    2,805.90x = 3,872.43 × 1,687.20
  4. Step 4: Simplify right side
    2,805.90x = 6,533,563.90
  5. Step 5: Solve for x
    x = 6,533,563.90/2,805.90
  6. Step 6: Final answer
    x = 2,328.51

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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.