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Finding the Fourth Proportional to 424.90, 636.94 and 219.39

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Solution

The fourth proportional to 424.90, 636.94 and 219.39 is: 328.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.90 : 636.94 = 219.39 : x
  2. Step 2: Convert to fraction form
    424.90/636.94 = 219.39/x
  3. Step 3: Cross multiply
    424.90x = 636.94 × 219.39
  4. Step 4: Simplify right side
    424.90x = 139,738.27
  5. Step 5: Solve for x
    x = 139,738.27/424.90
  6. Step 6: Final answer
    x = 328.87

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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.