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Finding the Fourth Proportional to 811.06, 1,216.78 and 263.20

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Solution

The fourth proportional to 811.06, 1,216.78 and 263.20 is: 394.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.06 : 1,216.78 = 263.20 : x
  2. Step 2: Convert to fraction form
    811.06/1,216.78 = 263.20/x
  3. Step 3: Cross multiply
    811.06x = 1,216.78 × 263.20
  4. Step 4: Simplify right side
    811.06x = 320,252.80
  5. Step 5: Solve for x
    x = 320,252.80/811.06
  6. Step 6: Final answer
    x = 394.86

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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.