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Finding the Fourth Proportional to 129.39, 192.87 and 122.55

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Solution

The fourth proportional to 129.39, 192.87 and 122.55 is: 182.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.39 : 192.87 = 122.55 : x
  2. Step 2: Convert to fraction form
    129.39/192.87 = 122.55/x
  3. Step 3: Cross multiply
    129.39x = 192.87 × 122.55
  4. Step 4: Simplify right side
    129.39x = 23,636.22
  5. Step 5: Solve for x
    x = 23,636.22/129.39
  6. Step 6: Final answer
    x = 182.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.