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Finding the Fourth Proportional to 385.19, 531.52 and 219.42

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Solution

The fourth proportional to 385.19, 531.52 and 219.42 is: 302.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.19 : 531.52 = 219.42 : x
  2. Step 2: Convert to fraction form
    385.19/531.52 = 219.42/x
  3. Step 3: Cross multiply
    385.19x = 531.52 × 219.42
  4. Step 4: Simplify right side
    385.19x = 116,627.86
  5. Step 5: Solve for x
    x = 116,627.86/385.19
  6. Step 6: Final answer
    x = 302.78

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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.