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Finding the Fourth Proportional to 426.44, 636.69 and 422.03

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Solution

The fourth proportional to 426.44, 636.69 and 422.03 is: 630.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.44 : 636.69 = 422.03 : x
  2. Step 2: Convert to fraction form
    426.44/636.69 = 422.03/x
  3. Step 3: Cross multiply
    426.44x = 636.69 × 422.03
  4. Step 4: Simplify right side
    426.44x = 268,703.87
  5. Step 5: Solve for x
    x = 268,703.87/426.44
  6. Step 6: Final answer
    x = 630.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.