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Finding the Fourth Proportional to 354.31, 488.99 and 223.30

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Solution

The fourth proportional to 354.31, 488.99 and 223.30 is: 308.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.31 : 488.99 = 223.30 : x
  2. Step 2: Convert to fraction form
    354.31/488.99 = 223.30/x
  3. Step 3: Cross multiply
    354.31x = 488.99 × 223.30
  4. Step 4: Simplify right side
    354.31x = 109,191.47
  5. Step 5: Solve for x
    x = 109,191.47/354.31
  6. Step 6: Final answer
    x = 308.18

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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.