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Finding the Fourth Proportional to 257.64, 355.39 and 195.49

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Solution

The fourth proportional to 257.64, 355.39 and 195.49 is: 269.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.64 : 355.39 = 195.49 : x
  2. Step 2: Convert to fraction form
    257.64/355.39 = 195.49/x
  3. Step 3: Cross multiply
    257.64x = 355.39 × 195.49
  4. Step 4: Simplify right side
    257.64x = 69,475.19
  5. Step 5: Solve for x
    x = 69,475.19/257.64
  6. Step 6: Final answer
    x = 269.66

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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.