Home / 2,074.10-3,111.21-687.51

Finding the Fourth Proportional to 2,074.10, 3,111.21 and 687.51

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Solution

The fourth proportional to 2,074.10, 3,111.21 and 687.51 is: 1,031.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,074.10 : 3,111.21 = 687.51 : x
  2. Step 2: Convert to fraction form
    2,074.10/3,111.21 = 687.51/x
  3. Step 3: Cross multiply
    2,074.10x = 3,111.21 × 687.51
  4. Step 4: Simplify right side
    2,074.10x = 2,138,987.99
  5. Step 5: Solve for x
    x = 2,138,987.99/2,074.10
  6. Step 6: Final answer
    x = 1,031.29

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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.