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Finding the Fourth Proportional to 791.34, 1,091.61 and 542.94

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Solution

The fourth proportional to 791.34, 1,091.61 and 542.94 is: 748.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.34 : 1,091.61 = 542.94 : x
  2. Step 2: Convert to fraction form
    791.34/1,091.61 = 542.94/x
  3. Step 3: Cross multiply
    791.34x = 1,091.61 × 542.94
  4. Step 4: Simplify right side
    791.34x = 592,678.73
  5. Step 5: Solve for x
    x = 592,678.73/791.34
  6. Step 6: Final answer
    x = 748.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.