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Finding the Fourth Proportional to 224.45, 309.74 and 131.21

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Solution

The fourth proportional to 224.45, 309.74 and 131.21 is: 181.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    224.45 : 309.74 = 131.21 : x
  2. Step 2: Convert to fraction form
    224.45/309.74 = 131.21/x
  3. Step 3: Cross multiply
    224.45x = 309.74 × 131.21
  4. Step 4: Simplify right side
    224.45x = 40,640.99
  5. Step 5: Solve for x
    x = 40,640.99/224.45
  6. Step 6: Final answer
    x = 181.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.