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Finding the Fourth Proportional to 389.30, 537.28 and 223.57

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Solution

The fourth proportional to 389.30, 537.28 and 223.57 is: 308.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.30 : 537.28 = 223.57 : x
  2. Step 2: Convert to fraction form
    389.30/537.28 = 223.57/x
  3. Step 3: Cross multiply
    389.30x = 537.28 × 223.57
  4. Step 4: Simplify right side
    389.30x = 120,119.69
  5. Step 5: Solve for x
    x = 120,119.69/389.30
  6. Step 6: Final answer
    x = 308.55

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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.