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Finding the Fourth Proportional to 422.30, 631.62 and 339.68

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Solution

The fourth proportional to 422.30, 631.62 and 339.68 is: 508.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.30 : 631.62 = 339.68 : x
  2. Step 2: Convert to fraction form
    422.30/631.62 = 339.68/x
  3. Step 3: Cross multiply
    422.30x = 631.62 × 339.68
  4. Step 4: Simplify right side
    422.30x = 214,548.68
  5. Step 5: Solve for x
    x = 214,548.68/422.30
  6. Step 6: Final answer
    x = 508.05

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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.