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Finding the Fourth Proportional to 257.36, 354.80 and 217.86

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Solution

The fourth proportional to 257.36, 354.80 and 217.86 is: 300.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.36 : 354.80 = 217.86 : x
  2. Step 2: Convert to fraction form
    257.36/354.80 = 217.86/x
  3. Step 3: Cross multiply
    257.36x = 354.80 × 217.86
  4. Step 4: Simplify right side
    257.36x = 77,295.64
  5. Step 5: Solve for x
    x = 77,295.64/257.36
  6. Step 6: Final answer
    x = 300.34

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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.