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Finding the Fourth Proportional to 512.79, 708.44 and 381.57

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Solution

The fourth proportional to 512.79, 708.44 and 381.57 is: 527.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.79 : 708.44 = 381.57 : x
  2. Step 2: Convert to fraction form
    512.79/708.44 = 381.57/x
  3. Step 3: Cross multiply
    512.79x = 708.44 × 381.57
  4. Step 4: Simplify right side
    512.79x = 270,317.54
  5. Step 5: Solve for x
    x = 270,317.54/512.79
  6. Step 6: Final answer
    x = 527.15

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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.