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Finding the Fourth Proportional to 791.92, 1,187.92 and 214.80

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Solution

The fourth proportional to 791.92, 1,187.92 and 214.80 is: 322.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.92 : 1,187.92 = 214.80 : x
  2. Step 2: Convert to fraction form
    791.92/1,187.92 = 214.80/x
  3. Step 3: Cross multiply
    791.92x = 1,187.92 × 214.80
  4. Step 4: Simplify right side
    791.92x = 255,165.22
  5. Step 5: Solve for x
    x = 255,165.22/791.92
  6. Step 6: Final answer
    x = 322.21

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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.