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Finding the Fourth Proportional to 253.45, 379.95 and 91.09

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Solution

The fourth proportional to 253.45, 379.95 and 91.09 is: 136.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.45 : 379.95 = 91.09 : x
  2. Step 2: Convert to fraction form
    253.45/379.95 = 91.09/x
  3. Step 3: Cross multiply
    253.45x = 379.95 × 91.09
  4. Step 4: Simplify right side
    253.45x = 34,609.65
  5. Step 5: Solve for x
    x = 34,609.65/253.45
  6. Step 6: Final answer
    x = 136.55

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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.