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Finding the Fourth Proportional to 422.42, 632.54 and 386.78

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Solution

The fourth proportional to 422.42, 632.54 and 386.78 is: 579.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.42 : 632.54 = 386.78 : x
  2. Step 2: Convert to fraction form
    422.42/632.54 = 386.78/x
  3. Step 3: Cross multiply
    422.42x = 632.54 × 386.78
  4. Step 4: Simplify right side
    422.42x = 244,651.63
  5. Step 5: Solve for x
    x = 244,651.63/422.42
  6. Step 6: Final answer
    x = 579.17

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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.