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Finding the Fourth Proportional to 791.79, 1,091.61 and 555.42

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Solution

The fourth proportional to 791.79, 1,091.61 and 555.42 is: 765.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.79 : 1,091.61 = 555.42 : x
  2. Step 2: Convert to fraction form
    791.79/1,091.61 = 555.42/x
  3. Step 3: Cross multiply
    791.79x = 1,091.61 × 555.42
  4. Step 4: Simplify right side
    791.79x = 606,302.03
  5. Step 5: Solve for x
    x = 606,302.03/791.79
  6. Step 6: Final answer
    x = 765.74

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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.