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Finding the Fourth Proportional to 528.57, 791.78 and 311.63

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Solution

The fourth proportional to 528.57, 791.78 and 311.63 is: 466.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.57 : 791.78 = 311.63 : x
  2. Step 2: Convert to fraction form
    528.57/791.78 = 311.63/x
  3. Step 3: Cross multiply
    528.57x = 791.78 × 311.63
  4. Step 4: Simplify right side
    528.57x = 246,736.88
  5. Step 5: Solve for x
    x = 246,736.88/528.57
  6. Step 6: Final answer
    x = 466.80

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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.