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Finding the Fourth Proportional to 281.62, 421.86 and 220.46

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Solution

The fourth proportional to 281.62, 421.86 and 220.46 is: 330.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.62 : 421.86 = 220.46 : x
  2. Step 2: Convert to fraction form
    281.62/421.86 = 220.46/x
  3. Step 3: Cross multiply
    281.62x = 421.86 × 220.46
  4. Step 4: Simplify right side
    281.62x = 93,003.26
  5. Step 5: Solve for x
    x = 93,003.26/281.62
  6. Step 6: Final answer
    x = 330.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.