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Finding the Fourth Proportional to 424.62, 636.69 and 219.15

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Solution

The fourth proportional to 424.62, 636.69 and 219.15 is: 328.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.62 : 636.69 = 219.15 : x
  2. Step 2: Convert to fraction form
    424.62/636.69 = 219.15/x
  3. Step 3: Cross multiply
    424.62x = 636.69 × 219.15
  4. Step 4: Simplify right side
    424.62x = 139,530.61
  5. Step 5: Solve for x
    x = 139,530.61/424.62
  6. Step 6: Final answer
    x = 328.60

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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.