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Finding the Fourth Proportional to 256.41, 352.89 and 238.59

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Solution

The fourth proportional to 256.41, 352.89 and 238.59 is: 328.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.41 : 352.89 = 238.59 : x
  2. Step 2: Convert to fraction form
    256.41/352.89 = 238.59/x
  3. Step 3: Cross multiply
    256.41x = 352.89 × 238.59
  4. Step 4: Simplify right side
    256.41x = 84,196.03
  5. Step 5: Solve for x
    x = 84,196.03/256.41
  6. Step 6: Final answer
    x = 328.36

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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.