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Finding the Fourth Proportional to 905.31, 1,249.36 and 512.33

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Solution

The fourth proportional to 905.31, 1,249.36 and 512.33 is: 707.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.31 : 1,249.36 = 512.33 : x
  2. Step 2: Convert to fraction form
    905.31/1,249.36 = 512.33/x
  3. Step 3: Cross multiply
    905.31x = 1,249.36 × 512.33
  4. Step 4: Simplify right side
    905.31x = 640,077.08
  5. Step 5: Solve for x
    x = 640,077.08/905.31
  6. Step 6: Final answer
    x = 707.03

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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.