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Finding the Fourth Proportional to 380.26, 570.39 and 136.65

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Solution

The fourth proportional to 380.26, 570.39 and 136.65 is: 204.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.26 : 570.39 = 136.65 : x
  2. Step 2: Convert to fraction form
    380.26/570.39 = 136.65/x
  3. Step 3: Cross multiply
    380.26x = 570.39 × 136.65
  4. Step 4: Simplify right side
    380.26x = 77,943.11
  5. Step 5: Solve for x
    x = 77,943.11/380.26
  6. Step 6: Final answer
    x = 204.98

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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.