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Finding the Fourth Proportional to 552.81, 762.88 and 331.78

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Solution

The fourth proportional to 552.81, 762.88 and 331.78 is: 457.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.81 : 762.88 = 331.78 : x
  2. Step 2: Convert to fraction form
    552.81/762.88 = 331.78/x
  3. Step 3: Cross multiply
    552.81x = 762.88 × 331.78
  4. Step 4: Simplify right side
    552.81x = 253,108.33
  5. Step 5: Solve for x
    x = 253,108.33/552.81
  6. Step 6: Final answer
    x = 457.86

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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.