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Finding the Fourth Proportional to 385.75, 578.71 and 142.27

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Solution

The fourth proportional to 385.75, 578.71 and 142.27 is: 213.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.75 : 578.71 = 142.27 : x
  2. Step 2: Convert to fraction form
    385.75/578.71 = 142.27/x
  3. Step 3: Cross multiply
    385.75x = 578.71 × 142.27
  4. Step 4: Simplify right side
    385.75x = 82,333.07
  5. Step 5: Solve for x
    x = 82,333.07/385.75
  6. Step 6: Final answer
    x = 213.44

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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.