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Finding the Fourth Proportional to 257.42, 355.09 and 195.13

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Solution

The fourth proportional to 257.42, 355.09 and 195.13 is: 269.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.42 : 355.09 = 195.13 : x
  2. Step 2: Convert to fraction form
    257.42/355.09 = 195.13/x
  3. Step 3: Cross multiply
    257.42x = 355.09 × 195.13
  4. Step 4: Simplify right side
    257.42x = 69,288.71
  5. Step 5: Solve for x
    x = 69,288.71/257.42
  6. Step 6: Final answer
    x = 269.17

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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.