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Finding the Fourth Proportional to 253.50, 379.94 and 138

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Solution

The fourth proportional to 253.50, 379.94 and 138 is: 206.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.50 : 379.94 = 138 : x
  2. Step 2: Convert to fraction form
    253.50/379.94 = 138/x
  3. Step 3: Cross multiply
    253.50x = 379.94 × 138
  4. Step 4: Simplify right side
    253.50x = 52,431.72
  5. Step 5: Solve for x
    x = 52,431.72/253.50
  6. Step 6: Final answer
    x = 206.83

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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.