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Finding the Fourth Proportional to 354.10, 488.49 and 221.23

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Solution

The fourth proportional to 354.10, 488.49 and 221.23 is: 305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.10 : 488.49 = 221.23 : x
  2. Step 2: Convert to fraction form
    354.10/488.49 = 221.23/x
  3. Step 3: Cross multiply
    354.10x = 488.49 × 221.23
  4. Step 4: Simplify right side
    354.10x = 108,070.04
  5. Step 5: Solve for x
    x = 108,070.04/354.10
  6. Step 6: Final answer
    x = 305.20

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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.