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Finding the Fourth Proportional to 352.28, 485.78 and 221.28

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Solution

The fourth proportional to 352.28, 485.78 and 221.28 is: 305.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.28 : 485.78 = 221.28 : x
  2. Step 2: Convert to fraction form
    352.28/485.78 = 221.28/x
  3. Step 3: Cross multiply
    352.28x = 485.78 × 221.28
  4. Step 4: Simplify right side
    352.28x = 107,492.29
  5. Step 5: Solve for x
    x = 107,492.29/352.28
  6. Step 6: Final answer
    x = 305.14

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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.