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Finding the Fourth Proportional to 281.89, 388.72 and 219.61

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Solution

The fourth proportional to 281.89, 388.72 and 219.61 is: 302.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.89 : 388.72 = 219.61 : x
  2. Step 2: Convert to fraction form
    281.89/388.72 = 219.61/x
  3. Step 3: Cross multiply
    281.89x = 388.72 × 219.61
  4. Step 4: Simplify right side
    281.89x = 85,366.80
  5. Step 5: Solve for x
    x = 85,366.80/281.89
  6. Step 6: Final answer
    x = 302.84

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.