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Finding the Fourth Proportional to 256.16, 353.44 and 193.21

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Solution

The fourth proportional to 256.16, 353.44 and 193.21 is: 266.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.16 : 353.44 = 193.21 : x
  2. Step 2: Convert to fraction form
    256.16/353.44 = 193.21/x
  3. Step 3: Cross multiply
    256.16x = 353.44 × 193.21
  4. Step 4: Simplify right side
    256.16x = 68,288.83
  5. Step 5: Solve for x
    x = 68,288.83/256.16
  6. Step 6: Final answer
    x = 266.59

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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.