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Finding the Fourth Proportional to 863.81, 1,187.14 and 809.13

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Solution

The fourth proportional to 863.81, 1,187.14 and 809.13 is: 1,112.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.81 : 1,187.14 = 809.13 : x
  2. Step 2: Convert to fraction form
    863.81/1,187.14 = 809.13/x
  3. Step 3: Cross multiply
    863.81x = 1,187.14 × 809.13
  4. Step 4: Simplify right side
    863.81x = 960,548.57
  5. Step 5: Solve for x
    x = 960,548.57/863.81
  6. Step 6: Final answer
    x = 1,112.00

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.