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Finding the Fourth Proportional to 281.40, 421.86 and 220.32

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Solution

The fourth proportional to 281.40, 421.86 and 220.32 is: 330.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.40 : 421.86 = 220.32 : x
  2. Step 2: Convert to fraction form
    281.40/421.86 = 220.32/x
  3. Step 3: Cross multiply
    281.40x = 421.86 × 220.32
  4. Step 4: Simplify right side
    281.40x = 92,944.20
  5. Step 5: Solve for x
    x = 92,944.20/281.40
  6. Step 6: Final answer
    x = 330.29

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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.