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Finding the Fourth Proportional to 424.88, 636.48 and 207.80

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Solution

The fourth proportional to 424.88, 636.48 and 207.80 is: 311.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.88 : 636.48 = 207.80 : x
  2. Step 2: Convert to fraction form
    424.88/636.48 = 207.80/x
  3. Step 3: Cross multiply
    424.88x = 636.48 × 207.80
  4. Step 4: Simplify right side
    424.88x = 132,260.54
  5. Step 5: Solve for x
    x = 132,260.54/424.88
  6. Step 6: Final answer
    x = 311.29

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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.