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Finding the Fourth Proportional to 224.16, 309.36 and 136.79

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Solution

The fourth proportional to 224.16, 309.36 and 136.79 is: 188.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    224.16 : 309.36 = 136.79 : x
  2. Step 2: Convert to fraction form
    224.16/309.36 = 136.79/x
  3. Step 3: Cross multiply
    224.16x = 309.36 × 136.79
  4. Step 4: Simplify right side
    224.16x = 42,315.81
  5. Step 5: Solve for x
    x = 42,315.81/224.16
  6. Step 6: Final answer
    x = 188.78

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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.