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Finding the Fourth Proportional to 1,380.87, 1,905.66 and 791.46

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Solution

The fourth proportional to 1,380.87, 1,905.66 and 791.46 is: 1,092.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.87 : 1,905.66 = 791.46 : x
  2. Step 2: Convert to fraction form
    1,380.87/1,905.66 = 791.46/x
  3. Step 3: Cross multiply
    1,380.87x = 1,905.66 × 791.46
  4. Step 4: Simplify right side
    1,380.87x = 1,508,253.66
  5. Step 5: Solve for x
    x = 1,508,253.66/1,380.87
  6. Step 6: Final answer
    x = 1,092.25

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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.