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Finding the Fourth Proportional to 614.34, 921.78 and 422.28

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Solution

The fourth proportional to 614.34, 921.78 and 422.28 is: 633.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.34 : 921.78 = 422.28 : x
  2. Step 2: Convert to fraction form
    614.34/921.78 = 422.28/x
  3. Step 3: Cross multiply
    614.34x = 921.78 × 422.28
  4. Step 4: Simplify right side
    614.34x = 389,249.26
  5. Step 5: Solve for x
    x = 389,249.26/614.34
  6. Step 6: Final answer
    x = 633.61

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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.