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Finding the Fourth Proportional to 256.38, 353.80 and 139.94

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Solution

The fourth proportional to 256.38, 353.80 and 139.94 is: 193.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.38 : 353.80 = 139.94 : x
  2. Step 2: Convert to fraction form
    256.38/353.80 = 139.94/x
  3. Step 3: Cross multiply
    256.38x = 353.80 × 139.94
  4. Step 4: Simplify right side
    256.38x = 49,510.77
  5. Step 5: Solve for x
    x = 49,510.77/256.38
  6. Step 6: Final answer
    x = 193.11

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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.