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Finding the Fourth Proportional to 254.76, 350.78 and 221.82

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Solution

The fourth proportional to 254.76, 350.78 and 221.82 is: 305.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.76 : 350.78 = 221.82 : x
  2. Step 2: Convert to fraction form
    254.76/350.78 = 221.82/x
  3. Step 3: Cross multiply
    254.76x = 350.78 × 221.82
  4. Step 4: Simplify right side
    254.76x = 77,808.91
  5. Step 5: Solve for x
    x = 77,808.91/254.76
  6. Step 6: Final answer
    x = 305.42

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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.