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Finding the Fourth Proportional to 427.20, 639.33 and 262.56

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Solution

The fourth proportional to 427.20, 639.33 and 262.56 is: 392.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.20 : 639.33 = 262.56 : x
  2. Step 2: Convert to fraction form
    427.20/639.33 = 262.56/x
  3. Step 3: Cross multiply
    427.20x = 639.33 × 262.56
  4. Step 4: Simplify right side
    427.20x = 167,862.48
  5. Step 5: Solve for x
    x = 167,862.48/427.20
  6. Step 6: Final answer
    x = 392.94

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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.