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Finding the Fourth Proportional to 427.05, 639.33 and 324.75

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Solution

The fourth proportional to 427.05, 639.33 and 324.75 is: 486.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.05 : 639.33 = 324.75 : x
  2. Step 2: Convert to fraction form
    427.05/639.33 = 324.75/x
  3. Step 3: Cross multiply
    427.05x = 639.33 × 324.75
  4. Step 4: Simplify right side
    427.05x = 207,622.42
  5. Step 5: Solve for x
    x = 207,622.42/427.05
  6. Step 6: Final answer
    x = 486.18

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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.