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Finding the Fourth Proportional to 256.53, 354.05 and 191.22

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Solution

The fourth proportional to 256.53, 354.05 and 191.22 is: 263.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.53 : 354.05 = 191.22 : x
  2. Step 2: Convert to fraction form
    256.53/354.05 = 191.22/x
  3. Step 3: Cross multiply
    256.53x = 354.05 × 191.22
  4. Step 4: Simplify right side
    256.53x = 67,700.48
  5. Step 5: Solve for x
    x = 67,700.48/256.53
  6. Step 6: Final answer
    x = 263.91

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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.