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Finding the Fourth Proportional to 552.21, 762.78 and 386.97

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Solution

The fourth proportional to 552.21, 762.78 and 386.97 is: 534.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.21 : 762.78 = 386.97 : x
  2. Step 2: Convert to fraction form
    552.21/762.78 = 386.97/x
  3. Step 3: Cross multiply
    552.21x = 762.78 × 386.97
  4. Step 4: Simplify right side
    552.21x = 295,172.98
  5. Step 5: Solve for x
    x = 295,172.98/552.21
  6. Step 6: Final answer
    x = 534.53

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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.