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Finding the Fourth Proportional to 791.40, 1,091.94 and 459.74

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Solution

The fourth proportional to 791.40, 1,091.94 and 459.74 is: 634.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    791.40 : 1,091.94 = 459.74 : x
  2. Step 2: Convert to fraction form
    791.40/1,091.94 = 459.74/x
  3. Step 3: Cross multiply
    791.40x = 1,091.94 × 459.74
  4. Step 4: Simplify right side
    791.40x = 502,008.50
  5. Step 5: Solve for x
    x = 502,008.50/791.40
  6. Step 6: Final answer
    x = 634.33

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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.