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Finding the Fourth Proportional to 257.25, 354.23 and 220.34

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Solution

The fourth proportional to 257.25, 354.23 and 220.34 is: 303.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.25 : 354.23 = 220.34 : x
  2. Step 2: Convert to fraction form
    257.25/354.23 = 220.34/x
  3. Step 3: Cross multiply
    257.25x = 354.23 × 220.34
  4. Step 4: Simplify right side
    257.25x = 78,048.17
  5. Step 5: Solve for x
    x = 78,048.17/257.25
  6. Step 6: Final answer
    x = 303.39

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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.