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Finding the Fourth Proportional to 253.71, 380.42 and 80.34

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Solution

The fourth proportional to 253.71, 380.42 and 80.34 is: 120.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.71 : 380.42 = 80.34 : x
  2. Step 2: Convert to fraction form
    253.71/380.42 = 80.34/x
  3. Step 3: Cross multiply
    253.71x = 380.42 × 80.34
  4. Step 4: Simplify right side
    253.71x = 30,563.69
  5. Step 5: Solve for x
    x = 30,563.69/253.71
  6. Step 6: Final answer
    x = 120.47

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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.