Home / 3,891.15-5,369.78-2,122.76

Finding the Fourth Proportional to 3,891.15, 5,369.78 and 2,122.76

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Solution

The fourth proportional to 3,891.15, 5,369.78 and 2,122.76 is: 2,929.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.15 : 5,369.78 = 2,122.76 : x
  2. Step 2: Convert to fraction form
    3,891.15/5,369.78 = 2,122.76/x
  3. Step 3: Cross multiply
    3,891.15x = 5,369.78 × 2,122.76
  4. Step 4: Simplify right side
    3,891.15x = 11,398,727.34
  5. Step 5: Solve for x
    x = 11,398,727.34/3,891.15
  6. Step 6: Final answer
    x = 2,929.40

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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.