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Finding the Fourth Proportional to 631.64, 945.95 and 338.42

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Solution

The fourth proportional to 631.64, 945.95 and 338.42 is: 506.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.64 : 945.95 = 338.42 : x
  2. Step 2: Convert to fraction form
    631.64/945.95 = 338.42/x
  3. Step 3: Cross multiply
    631.64x = 945.95 × 338.42
  4. Step 4: Simplify right side
    631.64x = 320,125.28
  5. Step 5: Solve for x
    x = 320,125.28/631.64
  6. Step 6: Final answer
    x = 506.82

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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.