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Finding the Fourth Proportional to 816.22, 1,217.90 and 766.62

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Solution

The fourth proportional to 816.22, 1,217.90 and 766.62 is: 1,143.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.22 : 1,217.90 = 766.62 : x
  2. Step 2: Convert to fraction form
    816.22/1,217.90 = 766.62/x
  3. Step 3: Cross multiply
    816.22x = 1,217.90 × 766.62
  4. Step 4: Simplify right side
    816.22x = 933,660.41
  5. Step 5: Solve for x
    x = 933,660.41/816.22
  6. Step 6: Final answer
    x = 1,143.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.