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Finding the Fourth Proportional to 389.38, 537.28 and 223.56

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Solution

The fourth proportional to 389.38, 537.28 and 223.56 is: 308.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.38 : 537.28 = 223.56 : x
  2. Step 2: Convert to fraction form
    389.38/537.28 = 223.56/x
  3. Step 3: Cross multiply
    389.38x = 537.28 × 223.56
  4. Step 4: Simplify right side
    389.38x = 120,114.32
  5. Step 5: Solve for x
    x = 120,114.32/389.38
  6. Step 6: Final answer
    x = 308.48

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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.