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Finding the Fourth Proportional to 254.58, 380.85 and 220.71

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Solution

The fourth proportional to 254.58, 380.85 and 220.71 is: 330.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.58 : 380.85 = 220.71 : x
  2. Step 2: Convert to fraction form
    254.58/380.85 = 220.71/x
  3. Step 3: Cross multiply
    254.58x = 380.85 × 220.71
  4. Step 4: Simplify right side
    254.58x = 84,057.40
  5. Step 5: Solve for x
    x = 84,057.40/254.58
  6. Step 6: Final answer
    x = 330.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.