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Finding the Fourth Proportional to 253.91, 380.84 and 80.57

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Solution

The fourth proportional to 253.91, 380.84 and 80.57 is: 120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.91 : 380.84 = 80.57 : x
  2. Step 2: Convert to fraction form
    253.91/380.84 = 80.57/x
  3. Step 3: Cross multiply
    253.91x = 380.84 × 80.57
  4. Step 4: Simplify right side
    253.91x = 30,683.88
  5. Step 5: Solve for x
    x = 30,683.88/253.91
  6. Step 6: Final answer
    x = 120.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.