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Finding the Fourth Proportional to 254.21, 350.60 and 221.40

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Solution

The fourth proportional to 254.21, 350.60 and 221.40 is: 305.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.21 : 350.60 = 221.40 : x
  2. Step 2: Convert to fraction form
    254.21/350.60 = 221.40/x
  3. Step 3: Cross multiply
    254.21x = 350.60 × 221.40
  4. Step 4: Simplify right side
    254.21x = 77,621.73
  5. Step 5: Solve for x
    x = 77,621.73/254.21
  6. Step 6: Final answer
    x = 305.35

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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.