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Finding the Fourth Proportional to 905.70, 1,249.86 and 512.72

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Solution

The fourth proportional to 905.70, 1,249.86 and 512.72 is: 707.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.70 : 1,249.86 = 512.72 : x
  2. Step 2: Convert to fraction form
    905.70/1,249.86 = 512.72/x
  3. Step 3: Cross multiply
    905.70x = 1,249.86 × 512.72
  4. Step 4: Simplify right side
    905.70x = 640,821.97
  5. Step 5: Solve for x
    x = 640,821.97/905.70
  6. Step 6: Final answer
    x = 707.54

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Double scale
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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.