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Finding the Fourth Proportional to 380.82, 571.05 and 137.19

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Solution

The fourth proportional to 380.82, 571.05 and 137.19 is: 205.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.82 : 571.05 = 137.19 : x
  2. Step 2: Convert to fraction form
    380.82/571.05 = 137.19/x
  3. Step 3: Cross multiply
    380.82x = 571.05 × 137.19
  4. Step 4: Simplify right side
    380.82x = 78,342.35
  5. Step 5: Solve for x
    x = 78,342.35/380.82
  6. Step 6: Final answer
    x = 205.72

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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.