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Finding the Fourth Proportional to 916.20, 1,263.90 and 791.82

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Solution

The fourth proportional to 916.20, 1,263.90 and 791.82 is: 1,092.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.20 : 1,263.90 = 791.82 : x
  2. Step 2: Convert to fraction form
    916.20/1,263.90 = 791.82/x
  3. Step 3: Cross multiply
    916.20x = 1,263.90 × 791.82
  4. Step 4: Simplify right side
    916.20x = 1,000,781.30
  5. Step 5: Solve for x
    x = 1,000,781.30/916.20
  6. Step 6: Final answer
    x = 1,092.32

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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.