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Finding the Fourth Proportional to 253.99, 381.09 and 91.69

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Solution

The fourth proportional to 253.99, 381.09 and 91.69 is: 137.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.99 : 381.09 = 91.69 : x
  2. Step 2: Convert to fraction form
    253.99/381.09 = 91.69/x
  3. Step 3: Cross multiply
    253.99x = 381.09 × 91.69
  4. Step 4: Simplify right side
    253.99x = 34,943.09
  5. Step 5: Solve for x
    x = 34,943.09/253.99
  6. Step 6: Final answer
    x = 137.58

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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.