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Finding the Fourth Proportional to 129.07, 194.68 and 121.58

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Solution

The fourth proportional to 129.07, 194.68 and 121.58 is: 183.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.07 : 194.68 = 121.58 : x
  2. Step 2: Convert to fraction form
    129.07/194.68 = 121.58/x
  3. Step 3: Cross multiply
    129.07x = 194.68 × 121.58
  4. Step 4: Simplify right side
    129.07x = 23,669.19
  5. Step 5: Solve for x
    x = 23,669.19/129.07
  6. Step 6: Final answer
    x = 183.39

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.