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Finding the Fourth Proportional to 811.76, 1,217.12 and 263.84

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Solution

The fourth proportional to 811.76, 1,217.12 and 263.84 is: 395.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.76 : 1,217.12 = 263.84 : x
  2. Step 2: Convert to fraction form
    811.76/1,217.12 = 263.84/x
  3. Step 3: Cross multiply
    811.76x = 1,217.12 × 263.84
  4. Step 4: Simplify right side
    811.76x = 321,124.94
  5. Step 5: Solve for x
    x = 321,124.94/811.76
  6. Step 6: Final answer
    x = 395.59

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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.