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Finding the Fourth Proportional to 791.67, 1,187.51 and 214.59

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Solution

The fourth proportional to 791.67, 1,187.51 and 214.59 is: 321.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.67 : 1,187.51 = 214.59 : x
  2. Step 2: Convert to fraction form
    791.67/1,187.51 = 214.59/x
  3. Step 3: Cross multiply
    791.67x = 1,187.51 × 214.59
  4. Step 4: Simplify right side
    791.67x = 254,826.70
  5. Step 5: Solve for x
    x = 254,826.70/791.67
  6. Step 6: Final answer
    x = 321.89

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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.