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Finding the Fourth Proportional to 2,891.12, 4,336.95 and 811.13

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Solution

The fourth proportional to 2,891.12, 4,336.95 and 811.13 is: 1,216.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.12 : 4,336.95 = 811.13 : x
  2. Step 2: Convert to fraction form
    2,891.12/4,336.95 = 811.13/x
  3. Step 3: Cross multiply
    2,891.12x = 4,336.95 × 811.13
  4. Step 4: Simplify right side
    2,891.12x = 3,517,808.57
  5. Step 5: Solve for x
    x = 3,517,808.57/2,891.12
  6. Step 6: Final answer
    x = 1,216.77

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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.