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Finding the Fourth Proportional to 1,791.78, 2,472.64 and 1,005.85

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Solution

The fourth proportional to 1,791.78, 2,472.64 and 1,005.85 is: 1,388.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.78 : 2,472.64 = 1,005.85 : x
  2. Step 2: Convert to fraction form
    1,791.78/2,472.64 = 1,005.85/x
  3. Step 3: Cross multiply
    1,791.78x = 2,472.64 × 1,005.85
  4. Step 4: Simplify right side
    1,791.78x = 2,487,104.94
  5. Step 5: Solve for x
    x = 2,487,104.94/1,791.78
  6. Step 6: Final answer
    x = 1,388.06

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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.