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Finding the Fourth Proportional to 256.83, 354.40 and 158.55

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Solution

The fourth proportional to 256.83, 354.40 and 158.55 is: 218.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.83 : 354.40 = 158.55 : x
  2. Step 2: Convert to fraction form
    256.83/354.40 = 158.55/x
  3. Step 3: Cross multiply
    256.83x = 354.40 × 158.55
  4. Step 4: Simplify right side
    256.83x = 56,190.12
  5. Step 5: Solve for x
    x = 56,190.12/256.83
  6. Step 6: Final answer
    x = 218.78

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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.