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Finding the Fourth Proportional to 281.96, 389.49 and 220.57

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Solution

The fourth proportional to 281.96, 389.49 and 220.57 is: 304.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.96 : 389.49 = 220.57 : x
  2. Step 2: Convert to fraction form
    281.96/389.49 = 220.57/x
  3. Step 3: Cross multiply
    281.96x = 389.49 × 220.57
  4. Step 4: Simplify right side
    281.96x = 85,907.86
  5. Step 5: Solve for x
    x = 85,907.86/281.96
  6. Step 6: Final answer
    x = 304.68

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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.