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Finding the Fourth Proportional to 681.87, 1,027.79 and 623.44

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Solution

The fourth proportional to 681.87, 1,027.79 and 623.44 is: 939.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.87 : 1,027.79 = 623.44 : x
  2. Step 2: Convert to fraction form
    681.87/1,027.79 = 623.44/x
  3. Step 3: Cross multiply
    681.87x = 1,027.79 × 623.44
  4. Step 4: Simplify right side
    681.87x = 640,764.39
  5. Step 5: Solve for x
    x = 640,764.39/681.87
  6. Step 6: Final answer
    x = 939.72

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.