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Finding the Fourth Proportional to 816, 1,221.17 and 768.62

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Solution

The fourth proportional to 816, 1,221.17 and 768.62 is: 1,150.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    816 : 1,221.17 = 768.62 : x
  2. Step 2: Convert to fraction form
    816/1,221.17 = 768.62/x
  3. Step 3: Cross multiply
    816x = 1,221.17 × 768.62
  4. Step 4: Simplify right side
    816x = 938,605.74
  5. Step 5: Solve for x
    x = 938,605.74/816
  6. Step 6: Final answer
    x = 1,150.25

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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.