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Finding the Fourth Proportional to 791.30, 1,187.31 and 498.73

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Solution

The fourth proportional to 791.30, 1,187.31 and 498.73 is: 748.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.30 : 1,187.31 = 498.73 : x
  2. Step 2: Convert to fraction form
    791.30/1,187.31 = 498.73/x
  3. Step 3: Cross multiply
    791.30x = 1,187.31 × 498.73
  4. Step 4: Simplify right side
    791.30x = 592,147.12
  5. Step 5: Solve for x
    x = 592,147.12/791.30
  6. Step 6: Final answer
    x = 748.32

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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.