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Finding the Fourth Proportional to 791.16, 1,186.74 and 426.36

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Solution

The fourth proportional to 791.16, 1,186.74 and 426.36 is: 639.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.16 : 1,186.74 = 426.36 : x
  2. Step 2: Convert to fraction form
    791.16/1,186.74 = 426.36/x
  3. Step 3: Cross multiply
    791.16x = 1,186.74 × 426.36
  4. Step 4: Simplify right side
    791.16x = 505,978.47
  5. Step 5: Solve for x
    x = 505,978.47/791.16
  6. Step 6: Final answer
    x = 639.54

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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.