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Finding the Fourth Proportional to 1,295.61, 1,787.91 and 791.31

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Solution

The fourth proportional to 1,295.61, 1,787.91 and 791.31 is: 1,091.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,295.61 : 1,787.91 = 791.31 : x
  2. Step 2: Convert to fraction form
    1,295.61/1,787.91 = 791.31/x
  3. Step 3: Cross multiply
    1,295.61x = 1,787.91 × 791.31
  4. Step 4: Simplify right side
    1,295.61x = 1,414,791.06
  5. Step 5: Solve for x
    x = 1,414,791.06/1,295.61
  6. Step 6: Final answer
    x = 1,091.99

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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.