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Finding the Fourth Proportional to 791.86, 1,187.80 and 278.74

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Solution

The fourth proportional to 791.86, 1,187.80 and 278.74 is: 418.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.86 : 1,187.80 = 278.74 : x
  2. Step 2: Convert to fraction form
    791.86/1,187.80 = 278.74/x
  3. Step 3: Cross multiply
    791.86x = 1,187.80 × 278.74
  4. Step 4: Simplify right side
    791.86x = 331,087.37
  5. Step 5: Solve for x
    x = 331,087.37/791.86
  6. Step 6: Final answer
    x = 418.11

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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.