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Finding the Fourth Proportional to 251.06, 346.29 and 221.30

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Solution

The fourth proportional to 251.06, 346.29 and 221.30 is: 305.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.06 : 346.29 = 221.30 : x
  2. Step 2: Convert to fraction form
    251.06/346.29 = 221.30/x
  3. Step 3: Cross multiply
    251.06x = 346.29 × 221.30
  4. Step 4: Simplify right side
    251.06x = 76,633.98
  5. Step 5: Solve for x
    x = 76,633.98/251.06
  6. Step 6: Final answer
    x = 305.24

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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.