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Finding the Fourth Proportional to 905.62, 1,249.37 and 640.46

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Solution

The fourth proportional to 905.62, 1,249.37 and 640.46 is: 883.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.62 : 1,249.37 = 640.46 : x
  2. Step 2: Convert to fraction form
    905.62/1,249.37 = 640.46/x
  3. Step 3: Cross multiply
    905.62x = 1,249.37 × 640.46
  4. Step 4: Simplify right side
    905.62x = 800,171.51
  5. Step 5: Solve for x
    x = 800,171.51/905.62
  6. Step 6: Final answer
    x = 883.56

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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.