Home / 2,215.11-3,321.57-1,290.99

Finding the Fourth Proportional to 2,215.11, 3,321.57 and 1,290.99

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Solution

The fourth proportional to 2,215.11, 3,321.57 and 1,290.99 is: 1,935.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,215.11 : 3,321.57 = 1,290.99 : x
  2. Step 2: Convert to fraction form
    2,215.11/3,321.57 = 1,290.99/x
  3. Step 3: Cross multiply
    2,215.11x = 3,321.57 × 1,290.99
  4. Step 4: Simplify right side
    2,215.11x = 4,288,113.65
  5. Step 5: Solve for x
    x = 4,288,113.65/2,215.11
  6. Step 6: Final answer
    x = 1,935.85

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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.