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Finding the Fourth Proportional to 791.63, 1,186.41 and 425.63

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Solution

The fourth proportional to 791.63, 1,186.41 and 425.63 is: 637.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.63 : 1,186.41 = 425.63 : x
  2. Step 2: Convert to fraction form
    791.63/1,186.41 = 425.63/x
  3. Step 3: Cross multiply
    791.63x = 1,186.41 × 425.63
  4. Step 4: Simplify right side
    791.63x = 504,971.69
  5. Step 5: Solve for x
    x = 504,971.69/791.63
  6. Step 6: Final answer
    x = 637.89

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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.