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Finding the Fourth Proportional to 422.66, 634.01 and 145.01

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Solution

The fourth proportional to 422.66, 634.01 and 145.01 is: 217.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.66 : 634.01 = 145.01 : x
  2. Step 2: Convert to fraction form
    422.66/634.01 = 145.01/x
  3. Step 3: Cross multiply
    422.66x = 634.01 × 145.01
  4. Step 4: Simplify right side
    422.66x = 91,939.74
  5. Step 5: Solve for x
    x = 91,939.74/422.66
  6. Step 6: Final answer
    x = 217.53

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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.