Home / 2,118.13-3,179.21-885.20

Finding the Fourth Proportional to 2,118.13, 3,179.21 and 885.20

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Solution

The fourth proportional to 2,118.13, 3,179.21 and 885.20 is: 1,328.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.13 : 3,179.21 = 885.20 : x
  2. Step 2: Convert to fraction form
    2,118.13/3,179.21 = 885.20/x
  3. Step 3: Cross multiply
    2,118.13x = 3,179.21 × 885.20
  4. Step 4: Simplify right side
    2,118.13x = 2,814,236.69
  5. Step 5: Solve for x
    x = 2,814,236.69/2,118.13
  6. Step 6: Final answer
    x = 1,328.64

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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.