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Finding the Fourth Proportional to 382.36, 573.19 and 138.71

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Solution

The fourth proportional to 382.36, 573.19 and 138.71 is: 207.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.36 : 573.19 = 138.71 : x
  2. Step 2: Convert to fraction form
    382.36/573.19 = 138.71/x
  3. Step 3: Cross multiply
    382.36x = 573.19 × 138.71
  4. Step 4: Simplify right side
    382.36x = 79,508.07
  5. Step 5: Solve for x
    x = 79,508.07/382.36
  6. Step 6: Final answer
    x = 207.94

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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.