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Finding the Fourth Proportional to 129.21, 178.06 and 92.27

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Solution

The fourth proportional to 129.21, 178.06 and 92.27 is: 127.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.21 : 178.06 = 92.27 : x
  2. Step 2: Convert to fraction form
    129.21/178.06 = 92.27/x
  3. Step 3: Cross multiply
    129.21x = 178.06 × 92.27
  4. Step 4: Simplify right side
    129.21x = 16,429.60
  5. Step 5: Solve for x
    x = 16,429.60/129.21
  6. Step 6: Final answer
    x = 127.15

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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.