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Finding the Fourth Proportional to 512.40, 768.89 and 307.36

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Solution

The fourth proportional to 512.40, 768.89 and 307.36 is: 461.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.40 : 768.89 = 307.36 : x
  2. Step 2: Convert to fraction form
    512.40/768.89 = 307.36/x
  3. Step 3: Cross multiply
    512.40x = 768.89 × 307.36
  4. Step 4: Simplify right side
    512.40x = 236,326.03
  5. Step 5: Solve for x
    x = 236,326.03/512.40
  6. Step 6: Final answer
    x = 461.21

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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.