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Finding the Fourth Proportional to 256.44, 353.88 and 158.28

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Solution

The fourth proportional to 256.44, 353.88 and 158.28 is: 218.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.44 : 353.88 = 158.28 : x
  2. Step 2: Convert to fraction form
    256.44/353.88 = 158.28/x
  3. Step 3: Cross multiply
    256.44x = 353.88 × 158.28
  4. Step 4: Simplify right side
    256.44x = 56,012.13
  5. Step 5: Solve for x
    x = 56,012.13/256.44
  6. Step 6: Final answer
    x = 218.42

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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.