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Finding the Fourth Proportional to 256.55, 354.21 and 158.44

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Solution

The fourth proportional to 256.55, 354.21 and 158.44 is: 218.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.55 : 354.21 = 158.44 : x
  2. Step 2: Convert to fraction form
    256.55/354.21 = 158.44/x
  3. Step 3: Cross multiply
    256.55x = 354.21 × 158.44
  4. Step 4: Simplify right side
    256.55x = 56,118.47
  5. Step 5: Solve for x
    x = 56,118.47/256.55
  6. Step 6: Final answer
    x = 218.75

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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.