Home / 2,811.68-3,876-2,221.28

Finding the Fourth Proportional to 2,811.68, 3,876 and 2,221.28

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Solution

The fourth proportional to 2,811.68, 3,876 and 2,221.28 is: 3,062.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.68 : 3,876 = 2,221.28 : x
  2. Step 2: Convert to fraction form
    2,811.68/3,876 = 2,221.28/x
  3. Step 3: Cross multiply
    2,811.68x = 3,876 × 2,221.28
  4. Step 4: Simplify right side
    2,811.68x = 8,609,681.28
  5. Step 5: Solve for x
    x = 8,609,681.28/2,811.68
  6. Step 6: Final answer
    x = 3,062.11

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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.