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Finding the Fourth Proportional to 552.28, 828.90 and 321.40

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Solution

The fourth proportional to 552.28, 828.90 and 321.40 is: 482.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    552.28 : 828.90 = 321.40 : x
  2. Step 2: Convert to fraction form
    552.28/828.90 = 321.40/x
  3. Step 3: Cross multiply
    552.28x = 828.90 × 321.40
  4. Step 4: Simplify right side
    552.28x = 266,408.46
  5. Step 5: Solve for x
    x = 266,408.46/552.28
  6. Step 6: Final answer
    x = 482.38

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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.