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Finding the Fourth Proportional to 1,371.12, 1,891.89 and 811.14

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Solution

The fourth proportional to 1,371.12, 1,891.89 and 811.14 is: 1,119.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.12 : 1,891.89 = 811.14 : x
  2. Step 2: Convert to fraction form
    1,371.12/1,891.89 = 811.14/x
  3. Step 3: Cross multiply
    1,371.12x = 1,891.89 × 811.14
  4. Step 4: Simplify right side
    1,371.12x = 1,534,587.65
  5. Step 5: Solve for x
    x = 1,534,587.65/1,371.12
  6. Step 6: Final answer
    x = 1,119.22

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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.