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Finding the Fourth Proportional to 253.10, 379.58 and 108.78

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Solution

The fourth proportional to 253.10, 379.58 and 108.78 is: 163.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.10 : 379.58 = 108.78 : x
  2. Step 2: Convert to fraction form
    253.10/379.58 = 108.78/x
  3. Step 3: Cross multiply
    253.10x = 379.58 × 108.78
  4. Step 4: Simplify right side
    253.10x = 41,290.17
  5. Step 5: Solve for x
    x = 41,290.17/253.10
  6. Step 6: Final answer
    x = 163.14

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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.