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Finding the Fourth Proportional to 791.41, 1,187.11 and 214.28

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Solution

The fourth proportional to 791.41, 1,187.11 and 214.28 is: 321.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.41 : 1,187.11 = 214.28 : x
  2. Step 2: Convert to fraction form
    791.41/1,187.11 = 214.28/x
  3. Step 3: Cross multiply
    791.41x = 1,187.11 × 214.28
  4. Step 4: Simplify right side
    791.41x = 254,373.93
  5. Step 5: Solve for x
    x = 254,373.93/791.41
  6. Step 6: Final answer
    x = 321.42

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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.