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Finding the Fourth Proportional to 791.28, 1,187.49 and 531.78

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Solution

The fourth proportional to 791.28, 1,187.49 and 531.78 is: 798.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.28 : 1,187.49 = 531.78 : x
  2. Step 2: Convert to fraction form
    791.28/1,187.49 = 531.78/x
  3. Step 3: Cross multiply
    791.28x = 1,187.49 × 531.78
  4. Step 4: Simplify right side
    791.28x = 631,483.43
  5. Step 5: Solve for x
    x = 631,483.43/791.28
  6. Step 6: Final answer
    x = 798.05

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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.