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Finding the Fourth Proportional to 512.30, 768.40 and 147.08

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Solution

The fourth proportional to 512.30, 768.40 and 147.08 is: 220.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.30 : 768.40 = 147.08 : x
  2. Step 2: Convert to fraction form
    512.30/768.40 = 147.08/x
  3. Step 3: Cross multiply
    512.30x = 768.40 × 147.08
  4. Step 4: Simplify right side
    512.30x = 113,016.27
  5. Step 5: Solve for x
    x = 113,016.27/512.30
  6. Step 6: Final answer
    x = 220.61

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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.