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Finding the Fourth Proportional to 422.12, 631.95 and 259.31

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Solution

The fourth proportional to 422.12, 631.95 and 259.31 is: 388.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.12 : 631.95 = 259.31 : x
  2. Step 2: Convert to fraction form
    422.12/631.95 = 259.31/x
  3. Step 3: Cross multiply
    422.12x = 631.95 × 259.31
  4. Step 4: Simplify right side
    422.12x = 163,867.79
  5. Step 5: Solve for x
    x = 163,867.79/422.12
  6. Step 6: Final answer
    x = 388.21

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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.