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Finding the Fourth Proportional to 1,227.40, 1,693.78 and 667.88

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Solution

The fourth proportional to 1,227.40, 1,693.78 and 667.88 is: 921.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.40 : 1,693.78 = 667.88 : x
  2. Step 2: Convert to fraction form
    1,227.40/1,693.78 = 667.88/x
  3. Step 3: Cross multiply
    1,227.40x = 1,693.78 × 667.88
  4. Step 4: Simplify right side
    1,227.40x = 1,131,241.79
  5. Step 5: Solve for x
    x = 1,131,241.79/1,227.40
  6. Step 6: Final answer
    x = 921.66

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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.