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Finding the Fourth Proportional to 249.99, 374.99 and 105.81

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Solution

The fourth proportional to 249.99, 374.99 and 105.81 is: 158.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.99 : 374.99 = 105.81 : x
  2. Step 2: Convert to fraction form
    249.99/374.99 = 105.81/x
  3. Step 3: Cross multiply
    249.99x = 374.99 × 105.81
  4. Step 4: Simplify right side
    249.99x = 39,677.16
  5. Step 5: Solve for x
    x = 39,677.16/249.99
  6. Step 6: Final answer
    x = 158.72

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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.