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Finding the Fourth Proportional to 791.32, 1,187.01 and 214.18

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Solution

The fourth proportional to 791.32, 1,187.01 and 214.18 is: 321.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.32 : 1,187.01 = 214.18 : x
  2. Step 2: Convert to fraction form
    791.32/1,187.01 = 214.18/x
  3. Step 3: Cross multiply
    791.32x = 1,187.01 × 214.18
  4. Step 4: Simplify right side
    791.32x = 254,233.80
  5. Step 5: Solve for x
    x = 254,233.80/791.32
  6. Step 6: Final answer
    x = 321.28

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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.