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Finding the Fourth Proportional to 424.95, 636.89 and 219.12

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Solution

The fourth proportional to 424.95, 636.89 and 219.12 is: 328.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.95 : 636.89 = 219.12 : x
  2. Step 2: Convert to fraction form
    424.95/636.89 = 219.12/x
  3. Step 3: Cross multiply
    424.95x = 636.89 × 219.12
  4. Step 4: Simplify right side
    424.95x = 139,554.24
  5. Step 5: Solve for x
    x = 139,554.24/424.95
  6. Step 6: Final answer
    x = 328.40

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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.