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Finding the Fourth Proportional to 422.34, 633.69 and 386.52

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Solution

The fourth proportional to 422.34, 633.69 and 386.52 is: 579.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.34 : 633.69 = 386.52 : x
  2. Step 2: Convert to fraction form
    422.34/633.69 = 386.52/x
  3. Step 3: Cross multiply
    422.34x = 633.69 × 386.52
  4. Step 4: Simplify right side
    422.34x = 244,933.86
  5. Step 5: Solve for x
    x = 244,933.86/422.34
  6. Step 6: Final answer
    x = 579.94

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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.