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Finding the Fourth Proportional to 821.76, 1,234.24 and 808.96

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Solution

The fourth proportional to 821.76, 1,234.24 and 808.96 is: 1,215.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.76 : 1,234.24 = 808.96 : x
  2. Step 2: Convert to fraction form
    821.76/1,234.24 = 808.96/x
  3. Step 3: Cross multiply
    821.76x = 1,234.24 × 808.96
  4. Step 4: Simplify right side
    821.76x = 998,450.79
  5. Step 5: Solve for x
    x = 998,450.79/821.76
  6. Step 6: Final answer
    x = 1,215.02

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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.