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Finding the Fourth Proportional to 354.65, 489.47 and 221.94

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Solution

The fourth proportional to 354.65, 489.47 and 221.94 is: 306.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.65 : 489.47 = 221.94 : x
  2. Step 2: Convert to fraction form
    354.65/489.47 = 221.94/x
  3. Step 3: Cross multiply
    354.65x = 489.47 × 221.94
  4. Step 4: Simplify right side
    354.65x = 108,631.86
  5. Step 5: Solve for x
    x = 108,631.86/354.65
  6. Step 6: Final answer
    x = 306.31

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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.