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Finding the Fourth Proportional to 385.62, 578.18 and 212.37

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Solution

The fourth proportional to 385.62, 578.18 and 212.37 is: 318.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.62 : 578.18 = 212.37 : x
  2. Step 2: Convert to fraction form
    385.62/578.18 = 212.37/x
  3. Step 3: Cross multiply
    385.62x = 578.18 × 212.37
  4. Step 4: Simplify right side
    385.62x = 122,788.51
  5. Step 5: Solve for x
    x = 122,788.51/385.62
  6. Step 6: Final answer
    x = 318.42

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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.