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Finding the Fourth Proportional to 281.25, 421.11 and 220.50

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Solution

The fourth proportional to 281.25, 421.11 and 220.50 is: 330.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.25 : 421.11 = 220.50 : x
  2. Step 2: Convert to fraction form
    281.25/421.11 = 220.50/x
  3. Step 3: Cross multiply
    281.25x = 421.11 × 220.50
  4. Step 4: Simplify right side
    281.25x = 92,854.76
  5. Step 5: Solve for x
    x = 92,854.76/281.25
  6. Step 6: Final answer
    x = 330.15

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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.