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Finding the Fourth Proportional to 905.52, 1,249.65 and 512.55

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Solution

The fourth proportional to 905.52, 1,249.65 and 512.55 is: 707.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.52 : 1,249.65 = 512.55 : x
  2. Step 2: Convert to fraction form
    905.52/1,249.65 = 512.55/x
  3. Step 3: Cross multiply
    905.52x = 1,249.65 × 512.55
  4. Step 4: Simplify right side
    905.52x = 640,508.11
  5. Step 5: Solve for x
    x = 640,508.11/905.52
  6. Step 6: Final answer
    x = 707.34

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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.