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Finding the Fourth Proportional to 129.60, 178.61 and 121.23

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Solution

The fourth proportional to 129.60, 178.61 and 121.23 is: 167.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.60 : 178.61 = 121.23 : x
  2. Step 2: Convert to fraction form
    129.60/178.61 = 121.23/x
  3. Step 3: Cross multiply
    129.60x = 178.61 × 121.23
  4. Step 4: Simplify right side
    129.60x = 21,652.28
  5. Step 5: Solve for x
    x = 21,652.28/129.60
  6. Step 6: Final answer
    x = 167.07

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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.