Home / 2,759.43-4,139.28-811.65

Finding the Fourth Proportional to 2,759.43, 4,139.28 and 811.65

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Solution

The fourth proportional to 2,759.43, 4,139.28 and 811.65 is: 1,217.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,759.43 : 4,139.28 = 811.65 : x
  2. Step 2: Convert to fraction form
    2,759.43/4,139.28 = 811.65/x
  3. Step 3: Cross multiply
    2,759.43x = 4,139.28 × 811.65
  4. Step 4: Simplify right side
    2,759.43x = 3,359,646.61
  5. Step 5: Solve for x
    x = 3,359,646.61/2,759.43
  6. Step 6: Final answer
    x = 1,217.51

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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.