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Finding the Fourth Proportional to 257.22, 382.64 and 254.61

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Solution

The fourth proportional to 257.22, 382.64 and 254.61 is: 378.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.22 : 382.64 = 254.61 : x
  2. Step 2: Convert to fraction form
    257.22/382.64 = 254.61/x
  3. Step 3: Cross multiply
    257.22x = 382.64 × 254.61
  4. Step 4: Simplify right side
    257.22x = 97,422.70
  5. Step 5: Solve for x
    x = 97,422.70/257.22
  6. Step 6: Final answer
    x = 378.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.