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Finding the Fourth Proportional to 791.51, 1,186.20 and 547.61

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Solution

The fourth proportional to 791.51, 1,186.20 and 547.61 is: 820.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.51 : 1,186.20 = 547.61 : x
  2. Step 2: Convert to fraction form
    791.51/1,186.20 = 547.61/x
  3. Step 3: Cross multiply
    791.51x = 1,186.20 × 547.61
  4. Step 4: Simplify right side
    791.51x = 649,569.05
  5. Step 5: Solve for x
    x = 649,569.05/791.51
  6. Step 6: Final answer
    x = 820.68

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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.