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Finding the Fourth Proportional to 462.78, 639.36 and 438.48

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Solution

The fourth proportional to 462.78, 639.36 and 438.48 is: 605.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.78 : 639.36 = 438.48 : x
  2. Step 2: Convert to fraction form
    462.78/639.36 = 438.48/x
  3. Step 3: Cross multiply
    462.78x = 639.36 × 438.48
  4. Step 4: Simplify right side
    462.78x = 280,346.57
  5. Step 5: Solve for x
    x = 280,346.57/462.78
  6. Step 6: Final answer
    x = 605.79

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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.