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Finding the Fourth Proportional to 512.56, 768.72 and 238.72

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Solution

The fourth proportional to 512.56, 768.72 and 238.72 is: 358.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.56 : 768.72 = 238.72 : x
  2. Step 2: Convert to fraction form
    512.56/768.72 = 238.72/x
  3. Step 3: Cross multiply
    512.56x = 768.72 × 238.72
  4. Step 4: Simplify right side
    512.56x = 183,508.84
  5. Step 5: Solve for x
    x = 183,508.84/512.56
  6. Step 6: Final answer
    x = 358.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.