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Finding the Fourth Proportional to 377.12, 520.36 and 221.92

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Solution

The fourth proportional to 377.12, 520.36 and 221.92 is: 306.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.12 : 520.36 = 221.92 : x
  2. Step 2: Convert to fraction form
    377.12/520.36 = 221.92/x
  3. Step 3: Cross multiply
    377.12x = 520.36 × 221.92
  4. Step 4: Simplify right side
    377.12x = 115,478.29
  5. Step 5: Solve for x
    x = 115,478.29/377.12
  6. Step 6: Final answer
    x = 306.21

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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.