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Finding the Fourth Proportional to 422.81, 583.48 and 238.81

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Solution

The fourth proportional to 422.81, 583.48 and 238.81 is: 329.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.81 : 583.48 = 238.81 : x
  2. Step 2: Convert to fraction form
    422.81/583.48 = 238.81/x
  3. Step 3: Cross multiply
    422.81x = 583.48 × 238.81
  4. Step 4: Simplify right side
    422.81x = 139,342.91
  5. Step 5: Solve for x
    x = 139,342.91/422.81
  6. Step 6: Final answer
    x = 329.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.