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Finding the Fourth Proportional to 1,219.75, 1,683.26 and 667.75

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Solution

The fourth proportional to 1,219.75, 1,683.26 and 667.75 is: 921.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.75 : 1,683.26 = 667.75 : x
  2. Step 2: Convert to fraction form
    1,219.75/1,683.26 = 667.75/x
  3. Step 3: Cross multiply
    1,219.75x = 1,683.26 × 667.75
  4. Step 4: Simplify right side
    1,219.75x = 1,123,996.87
  5. Step 5: Solve for x
    x = 1,123,996.87/1,219.75
  6. Step 6: Final answer
    x = 921.50

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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.