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Finding the Fourth Proportional to 890.22, 1,336.43 and 422.14

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Solution

The fourth proportional to 890.22, 1,336.43 and 422.14 is: 633.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.22 : 1,336.43 = 422.14 : x
  2. Step 2: Convert to fraction form
    890.22/1,336.43 = 422.14/x
  3. Step 3: Cross multiply
    890.22x = 1,336.43 × 422.14
  4. Step 4: Simplify right side
    890.22x = 564,160.56
  5. Step 5: Solve for x
    x = 564,160.56/890.22
  6. Step 6: Final answer
    x = 633.73

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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.