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Finding the Fourth Proportional to 380.35, 570.57 and 136.81

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Solution

The fourth proportional to 380.35, 570.57 and 136.81 is: 205.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.35 : 570.57 = 136.81 : x
  2. Step 2: Convert to fraction form
    380.35/570.57 = 136.81/x
  3. Step 3: Cross multiply
    380.35x = 570.57 × 136.81
  4. Step 4: Simplify right side
    380.35x = 78,059.68
  5. Step 5: Solve for x
    x = 78,059.68/380.35
  6. Step 6: Final answer
    x = 205.23

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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.