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Finding the Fourth Proportional to 905.92, 1,249.90 and 512.87

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Solution

The fourth proportional to 905.92, 1,249.90 and 512.87 is: 707.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.92 : 1,249.90 = 512.87 : x
  2. Step 2: Convert to fraction form
    905.92/1,249.90 = 512.87/x
  3. Step 3: Cross multiply
    905.92x = 1,249.90 × 512.87
  4. Step 4: Simplify right side
    905.92x = 641,028.68
  5. Step 5: Solve for x
    x = 641,028.68/905.92
  6. Step 6: Final answer
    x = 707.60

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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.