Home / 3,811.90-5,718.78-1,215.04

Finding the Fourth Proportional to 3,811.90, 5,718.78 and 1,215.04

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Solution

The fourth proportional to 3,811.90, 5,718.78 and 1,215.04 is: 1,822.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,811.90 : 5,718.78 = 1,215.04 : x
  2. Step 2: Convert to fraction form
    3,811.90/5,718.78 = 1,215.04/x
  3. Step 3: Cross multiply
    3,811.90x = 5,718.78 × 1,215.04
  4. Step 4: Simplify right side
    3,811.90x = 6,948,546.45
  5. Step 5: Solve for x
    x = 6,948,546.45/3,811.90
  6. Step 6: Final answer
    x = 1,822.86

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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.