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Finding the Fourth Proportional to 563.90, 778.24 and 331

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Solution

The fourth proportional to 563.90, 778.24 and 331 is: 456.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.90 : 778.24 = 331 : x
  2. Step 2: Convert to fraction form
    563.90/778.24 = 331/x
  3. Step 3: Cross multiply
    563.90x = 778.24 × 331
  4. Step 4: Simplify right side
    563.90x = 257,597.44
  5. Step 5: Solve for x
    x = 257,597.44/563.90
  6. Step 6: Final answer
    x = 456.81

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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.