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Finding the Fourth Proportional to 281.98, 388.95 and 219.70

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Solution

The fourth proportional to 281.98, 388.95 and 219.70 is: 303.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.98 : 388.95 = 219.70 : x
  2. Step 2: Convert to fraction form
    281.98/388.95 = 219.70/x
  3. Step 3: Cross multiply
    281.98x = 388.95 × 219.70
  4. Step 4: Simplify right side
    281.98x = 85,452.32
  5. Step 5: Solve for x
    x = 85,452.32/281.98
  6. Step 6: Final answer
    x = 303.04

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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.