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Finding the Fourth Proportional to 791.43, 1,187.73 and 639.18

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Solution

The fourth proportional to 791.43, 1,187.73 and 639.18 is: 959.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.43 : 1,187.73 = 639.18 : x
  2. Step 2: Convert to fraction form
    791.43/1,187.73 = 639.18/x
  3. Step 3: Cross multiply
    791.43x = 1,187.73 × 639.18
  4. Step 4: Simplify right side
    791.43x = 759,173.26
  5. Step 5: Solve for x
    x = 759,173.26/791.43
  6. Step 6: Final answer
    x = 959.24

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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.