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Finding the Fourth Proportional to 385.57, 532.11 and 219.79

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Solution

The fourth proportional to 385.57, 532.11 and 219.79 is: 303.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.57 : 532.11 = 219.79 : x
  2. Step 2: Convert to fraction form
    385.57/532.11 = 219.79/x
  3. Step 3: Cross multiply
    385.57x = 532.11 × 219.79
  4. Step 4: Simplify right side
    385.57x = 116,949.80
  5. Step 5: Solve for x
    x = 116,949.80/385.57
  6. Step 6: Final answer
    x = 303.32

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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.