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Finding the Fourth Proportional to 224.09, 336.29 and 85.39

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Solution

The fourth proportional to 224.09, 336.29 and 85.39 is: 128.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    224.09 : 336.29 = 85.39 : x
  2. Step 2: Convert to fraction form
    224.09/336.29 = 85.39/x
  3. Step 3: Cross multiply
    224.09x = 336.29 × 85.39
  4. Step 4: Simplify right side
    224.09x = 28,715.38
  5. Step 5: Solve for x
    x = 28,715.38/224.09
  6. Step 6: Final answer
    x = 128.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.