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Finding the Fourth Proportional to 253.82, 380.73 and 71.22

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Solution

The fourth proportional to 253.82, 380.73 and 71.22 is: 106.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.82 : 380.73 = 71.22 : x
  2. Step 2: Convert to fraction form
    253.82/380.73 = 71.22/x
  3. Step 3: Cross multiply
    253.82x = 380.73 × 71.22
  4. Step 4: Simplify right side
    253.82x = 27,113.69
  5. Step 5: Solve for x
    x = 27,113.69/253.82
  6. Step 6: Final answer
    x = 106.82

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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.