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Finding the Fourth Proportional to 385.21, 531.52 and 219.39

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Solution

The fourth proportional to 385.21, 531.52 and 219.39 is: 302.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.21 : 531.52 = 219.39 : x
  2. Step 2: Convert to fraction form
    385.21/531.52 = 219.39/x
  3. Step 3: Cross multiply
    385.21x = 531.52 × 219.39
  4. Step 4: Simplify right side
    385.21x = 116,610.72
  5. Step 5: Solve for x
    x = 116,610.72/385.21
  6. Step 6: Final answer
    x = 302.72

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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.