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Finding the Fourth Proportional to 224.50, 309.78 and 131.20

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Solution

The fourth proportional to 224.50, 309.78 and 131.20 is: 181.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    224.50 : 309.78 = 131.20 : x
  2. Step 2: Convert to fraction form
    224.50/309.78 = 131.20/x
  3. Step 3: Cross multiply
    224.50x = 309.78 × 131.20
  4. Step 4: Simplify right side
    224.50x = 40,643.14
  5. Step 5: Solve for x
    x = 40,643.14/224.50
  6. Step 6: Final answer
    x = 181.04

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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.