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Finding the Fourth Proportional to 905.46, 1,249.46 and 512.48

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Solution

The fourth proportional to 905.46, 1,249.46 and 512.48 is: 707.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.46 : 1,249.46 = 512.48 : x
  2. Step 2: Convert to fraction form
    905.46/1,249.46 = 512.48/x
  3. Step 3: Cross multiply
    905.46x = 1,249.46 × 512.48
  4. Step 4: Simplify right side
    905.46x = 640,323.26
  5. Step 5: Solve for x
    x = 640,323.26/905.46
  6. Step 6: Final answer
    x = 707.18

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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.