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Finding the Fourth Proportional to 422.11, 632.23 and 259.30

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Solution

The fourth proportional to 422.11, 632.23 and 259.30 is: 388.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.11 : 632.23 = 259.30 : x
  2. Step 2: Convert to fraction form
    422.11/632.23 = 259.30/x
  3. Step 3: Cross multiply
    422.11x = 632.23 × 259.30
  4. Step 4: Simplify right side
    422.11x = 163,937.24
  5. Step 5: Solve for x
    x = 163,937.24/422.11
  6. Step 6: Final answer
    x = 388.38

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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.