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Finding the Fourth Proportional to 257.81, 355.79 and 141.38

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Solution

The fourth proportional to 257.81, 355.79 and 141.38 is: 195.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.81 : 355.79 = 141.38 : x
  2. Step 2: Convert to fraction form
    257.81/355.79 = 141.38/x
  3. Step 3: Cross multiply
    257.81x = 355.79 × 141.38
  4. Step 4: Simplify right side
    257.81x = 50,299.10
  5. Step 5: Solve for x
    x = 50,299.10/257.81
  6. Step 6: Final answer
    x = 195.10

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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.