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Finding the Fourth Proportional to 940.53, 1,408.89 and 863.97

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Solution

The fourth proportional to 940.53, 1,408.89 and 863.97 is: 1,294.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.53 : 1,408.89 = 863.97 : x
  2. Step 2: Convert to fraction form
    940.53/1,408.89 = 863.97/x
  3. Step 3: Cross multiply
    940.53x = 1,408.89 × 863.97
  4. Step 4: Simplify right side
    940.53x = 1,217,238.69
  5. Step 5: Solve for x
    x = 1,217,238.69/940.53
  6. Step 6: Final answer
    x = 1,294.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.