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Finding the Fourth Proportional to 376.96, 520.24 and 221.72

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Solution

The fourth proportional to 376.96, 520.24 and 221.72 is: 305.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    376.96 : 520.24 = 221.72 : x
  2. Step 2: Convert to fraction form
    376.96/520.24 = 221.72/x
  3. Step 3: Cross multiply
    376.96x = 520.24 × 221.72
  4. Step 4: Simplify right side
    376.96x = 115,347.61
  5. Step 5: Solve for x
    x = 115,347.61/376.96
  6. Step 6: Final answer
    x = 305.99

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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.