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Finding the Fourth Proportional to 820.18, 1,231.50 and 791.84

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Solution

The fourth proportional to 820.18, 1,231.50 and 791.84 is: 1,188.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.18 : 1,231.50 = 791.84 : x
  2. Step 2: Convert to fraction form
    820.18/1,231.50 = 791.84/x
  3. Step 3: Cross multiply
    820.18x = 1,231.50 × 791.84
  4. Step 4: Simplify right side
    820.18x = 975,150.96
  5. Step 5: Solve for x
    x = 975,150.96/820.18
  6. Step 6: Final answer
    x = 1,188.95

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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.