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Finding the Fourth Proportional to 224, 309.12 and 136.68

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Solution

The fourth proportional to 224, 309.12 and 136.68 is: 188.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    224 : 309.12 = 136.68 : x
  2. Step 2: Convert to fraction form
    224/309.12 = 136.68/x
  3. Step 3: Cross multiply
    224x = 309.12 × 136.68
  4. Step 4: Simplify right side
    224x = 42,250.52
  5. Step 5: Solve for x
    x = 42,250.52/224
  6. Step 6: Final answer
    x = 188.62

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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.