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Finding the Fourth Proportional to 424.22, 636.30 and 391.61

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Solution

The fourth proportional to 424.22, 636.30 and 391.61 is: 587.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.22 : 636.30 = 391.61 : x
  2. Step 2: Convert to fraction form
    424.22/636.30 = 391.61/x
  3. Step 3: Cross multiply
    424.22x = 636.30 × 391.61
  4. Step 4: Simplify right side
    424.22x = 249,183.03
  5. Step 5: Solve for x
    x = 249,183.03/424.22
  6. Step 6: Final answer
    x = 587.40

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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.