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Finding the Fourth Proportional to 380.28, 570.61 and 136.83

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Solution

The fourth proportional to 380.28, 570.61 and 136.83 is: 205.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.28 : 570.61 = 136.83 : x
  2. Step 2: Convert to fraction form
    380.28/570.61 = 136.83/x
  3. Step 3: Cross multiply
    380.28x = 570.61 × 136.83
  4. Step 4: Simplify right side
    380.28x = 78,073.03
  5. Step 5: Solve for x
    x = 78,073.03/380.28
  6. Step 6: Final answer
    x = 205.30

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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.