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Finding the Fourth Proportional to 224.21, 309.37 and 135.68

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Solution

The fourth proportional to 224.21, 309.37 and 135.68 is: 187.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    224.21 : 309.37 = 135.68 : x
  2. Step 2: Convert to fraction form
    224.21/309.37 = 135.68/x
  3. Step 3: Cross multiply
    224.21x = 309.37 × 135.68
  4. Step 4: Simplify right side
    224.21x = 41,974.26
  5. Step 5: Solve for x
    x = 41,974.26/224.21
  6. Step 6: Final answer
    x = 187.21

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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.