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Finding the Fourth Proportional to 256.11, 353.43 and 139.68

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Solution

The fourth proportional to 256.11, 353.43 and 139.68 is: 192.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.11 : 353.43 = 139.68 : x
  2. Step 2: Convert to fraction form
    256.11/353.43 = 139.68/x
  3. Step 3: Cross multiply
    256.11x = 353.43 × 139.68
  4. Step 4: Simplify right side
    256.11x = 49,365.34
  5. Step 5: Solve for x
    x = 49,365.34/256.11
  6. Step 6: Final answer
    x = 192.75

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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.