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Finding the Fourth Proportional to 791.25, 1,186.88 and 214.13

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Solution

The fourth proportional to 791.25, 1,186.88 and 214.13 is: 321.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.25 : 1,186.88 = 214.13 : x
  2. Step 2: Convert to fraction form
    791.25/1,186.88 = 214.13/x
  3. Step 3: Cross multiply
    791.25x = 1,186.88 × 214.13
  4. Step 4: Simplify right side
    791.25x = 254,139.61
  5. Step 5: Solve for x
    x = 254,139.61/791.25
  6. Step 6: Final answer
    x = 321.19

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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.