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Finding the Fourth Proportional to 1,791.80, 2,472.72 and 1,005.90

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Solution

The fourth proportional to 1,791.80, 2,472.72 and 1,005.90 is: 1,388.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791.80 : 2,472.72 = 1,005.90 : x
  2. Step 2: Convert to fraction form
    1,791.80/2,472.72 = 1,005.90/x
  3. Step 3: Cross multiply
    1,791.80x = 2,472.72 × 1,005.90
  4. Step 4: Simplify right side
    1,791.80x = 2,487,309.05
  5. Step 5: Solve for x
    x = 2,487,309.05/1,791.80
  6. Step 6: Final answer
    x = 1,388.16

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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.