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Finding the Fourth Proportional to 385.87, 578.73 and 142.34

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Solution

The fourth proportional to 385.87, 578.73 and 142.34 is: 213.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.87 : 578.73 = 142.34 : x
  2. Step 2: Convert to fraction form
    385.87/578.73 = 142.34/x
  3. Step 3: Cross multiply
    385.87x = 578.73 × 142.34
  4. Step 4: Simplify right side
    385.87x = 82,374.09
  5. Step 5: Solve for x
    x = 82,374.09/385.87
  6. Step 6: Final answer
    x = 213.48

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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.