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Finding the Fourth Proportional to 424.20, 636.21 and 146.52

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Solution

The fourth proportional to 424.20, 636.21 and 146.52 is: 219.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.20 : 636.21 = 146.52 : x
  2. Step 2: Convert to fraction form
    424.20/636.21 = 146.52/x
  3. Step 3: Cross multiply
    424.20x = 636.21 × 146.52
  4. Step 4: Simplify right side
    424.20x = 93,217.49
  5. Step 5: Solve for x
    x = 93,217.49/424.20
  6. Step 6: Final answer
    x = 219.75

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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.