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Finding the Fourth Proportional to 422.76, 634.36 and 386.32

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Solution

The fourth proportional to 422.76, 634.36 and 386.32 is: 579.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.76 : 634.36 = 386.32 : x
  2. Step 2: Convert to fraction form
    422.76/634.36 = 386.32/x
  3. Step 3: Cross multiply
    422.76x = 634.36 × 386.32
  4. Step 4: Simplify right side
    422.76x = 245,065.96
  5. Step 5: Solve for x
    x = 245,065.96/422.76
  6. Step 6: Final answer
    x = 579.68

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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.