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Finding the Fourth Proportional to 905.92, 1,249.18 and 717.30

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Solution

The fourth proportional to 905.92, 1,249.18 and 717.30 is: 989.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.92 : 1,249.18 = 717.30 : x
  2. Step 2: Convert to fraction form
    905.92/1,249.18 = 717.30/x
  3. Step 3: Cross multiply
    905.92x = 1,249.18 × 717.30
  4. Step 4: Simplify right side
    905.92x = 896,035.02
  5. Step 5: Solve for x
    x = 896,035.02/905.92
  6. Step 6: Final answer
    x = 989.09

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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.