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Finding the Fourth Proportional to 256.74, 354.20 and 158.45

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Solution

The fourth proportional to 256.74, 354.20 and 158.45 is: 218.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.74 : 354.20 = 158.45 : x
  2. Step 2: Convert to fraction form
    256.74/354.20 = 158.45/x
  3. Step 3: Cross multiply
    256.74x = 354.20 × 158.45
  4. Step 4: Simplify right side
    256.74x = 56,120.43
  5. Step 5: Solve for x
    x = 56,120.43/256.74
  6. Step 6: Final answer
    x = 218.59

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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.