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Finding the Fourth Proportional to 380.78, 571.11 and 113.57

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Solution

The fourth proportional to 380.78, 571.11 and 113.57 is: 170.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.78 : 571.11 = 113.57 : x
  2. Step 2: Convert to fraction form
    380.78/571.11 = 113.57/x
  3. Step 3: Cross multiply
    380.78x = 571.11 × 113.57
  4. Step 4: Simplify right side
    380.78x = 64,860.96
  5. Step 5: Solve for x
    x = 64,860.96/380.78
  6. Step 6: Final answer
    x = 170.34

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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.