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Finding the Fourth Proportional to 424.21, 636.41 and 135.63

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Solution

The fourth proportional to 424.21, 636.41 and 135.63 is: 203.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.21 : 636.41 = 135.63 : x
  2. Step 2: Convert to fraction form
    424.21/636.41 = 135.63/x
  3. Step 3: Cross multiply
    424.21x = 636.41 × 135.63
  4. Step 4: Simplify right side
    424.21x = 86,316.29
  5. Step 5: Solve for x
    x = 86,316.29/424.21
  6. Step 6: Final answer
    x = 203.48

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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.