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Finding the Fourth Proportional to 811.27, 1,216.92 and 263.43

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Solution

The fourth proportional to 811.27, 1,216.92 and 263.43 is: 395.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.27 : 1,216.92 = 263.43 : x
  2. Step 2: Convert to fraction form
    811.27/1,216.92 = 263.43/x
  3. Step 3: Cross multiply
    811.27x = 1,216.92 × 263.43
  4. Step 4: Simplify right side
    811.27x = 320,573.24
  5. Step 5: Solve for x
    x = 320,573.24/811.27
  6. Step 6: Final answer
    x = 395.15

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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.