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Finding the Fourth Proportional to 382.49, 573.22 and 138.78

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Solution

The fourth proportional to 382.49, 573.22 and 138.78 is: 207.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.49 : 573.22 = 138.78 : x
  2. Step 2: Convert to fraction form
    382.49/573.22 = 138.78/x
  3. Step 3: Cross multiply
    382.49x = 573.22 × 138.78
  4. Step 4: Simplify right side
    382.49x = 79,551.12
  5. Step 5: Solve for x
    x = 79,551.12/382.49
  6. Step 6: Final answer
    x = 207.98

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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.