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Finding the Fourth Proportional to 818.84, 1,221.55 and 791.13

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Solution

The fourth proportional to 818.84, 1,221.55 and 791.13 is: 1,180.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.84 : 1,221.55 = 791.13 : x
  2. Step 2: Convert to fraction form
    818.84/1,221.55 = 791.13/x
  3. Step 3: Cross multiply
    818.84x = 1,221.55 × 791.13
  4. Step 4: Simplify right side
    818.84x = 966,407.45
  5. Step 5: Solve for x
    x = 966,407.45/818.84
  6. Step 6: Final answer
    x = 1,180.21

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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.