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Finding the Fourth Proportional to 354.48, 489.08 and 221.72

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Solution

The fourth proportional to 354.48, 489.08 and 221.72 is: 305.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.48 : 489.08 = 221.72 : x
  2. Step 2: Convert to fraction form
    354.48/489.08 = 221.72/x
  3. Step 3: Cross multiply
    354.48x = 489.08 × 221.72
  4. Step 4: Simplify right side
    354.48x = 108,436.93
  5. Step 5: Solve for x
    x = 108,436.93/354.48
  6. Step 6: Final answer
    x = 305.91

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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.