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Finding the Fourth Proportional to 385.11, 531.30 and 219.29

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Solution

The fourth proportional to 385.11, 531.30 and 219.29 is: 302.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.11 : 531.30 = 219.29 : x
  2. Step 2: Convert to fraction form
    385.11/531.30 = 219.29/x
  3. Step 3: Cross multiply
    385.11x = 531.30 × 219.29
  4. Step 4: Simplify right side
    385.11x = 116,511.56
  5. Step 5: Solve for x
    x = 116,511.56/385.11
  6. Step 6: Final answer
    x = 302.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.