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Finding the Fourth Proportional to 257.25, 355.15 and 174.43

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Solution

The fourth proportional to 257.25, 355.15 and 174.43 is: 240.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.25 : 355.15 = 174.43 : x
  2. Step 2: Convert to fraction form
    257.25/355.15 = 174.43/x
  3. Step 3: Cross multiply
    257.25x = 355.15 × 174.43
  4. Step 4: Simplify right side
    257.25x = 61,948.81
  5. Step 5: Solve for x
    x = 61,948.81/257.25
  6. Step 6: Final answer
    x = 240.81

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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.