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Finding the Fourth Proportional to 791.79, 1,186.39 and 761.82

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Solution

The fourth proportional to 791.79, 1,186.39 and 761.82 is: 1,141.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.79 : 1,186.39 = 761.82 : x
  2. Step 2: Convert to fraction form
    791.79/1,186.39 = 761.82/x
  3. Step 3: Cross multiply
    791.79x = 1,186.39 × 761.82
  4. Step 4: Simplify right side
    791.79x = 903,815.63
  5. Step 5: Solve for x
    x = 903,815.63/791.79
  6. Step 6: Final answer
    x = 1,141.48

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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.