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Finding the Fourth Proportional to 354.25, 488.73 and 223.21

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Solution

The fourth proportional to 354.25, 488.73 and 223.21 is: 307.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.25 : 488.73 = 223.21 : x
  2. Step 2: Convert to fraction form
    354.25/488.73 = 223.21/x
  3. Step 3: Cross multiply
    354.25x = 488.73 × 223.21
  4. Step 4: Simplify right side
    354.25x = 109,089.42
  5. Step 5: Solve for x
    x = 109,089.42/354.25
  6. Step 6: Final answer
    x = 307.94

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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.