Home / 1,540.75-2,126.30-868.78

Finding the Fourth Proportional to 1,540.75, 2,126.30 and 868.78

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Solution

The fourth proportional to 1,540.75, 2,126.30 and 868.78 is: 1,198.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,540.75 : 2,126.30 = 868.78 : x
  2. Step 2: Convert to fraction form
    1,540.75/2,126.30 = 868.78/x
  3. Step 3: Cross multiply
    1,540.75x = 2,126.30 × 868.78
  4. Step 4: Simplify right side
    1,540.75x = 1,847,271.94
  5. Step 5: Solve for x
    x = 1,847,271.94/1,540.75
  6. Step 6: Final answer
    x = 1,198.95

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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.