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Finding the Fourth Proportional to 129.65, 193.69 and 121.11

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Solution

The fourth proportional to 129.65, 193.69 and 121.11 is: 180.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.65 : 193.69 = 121.11 : x
  2. Step 2: Convert to fraction form
    129.65/193.69 = 121.11/x
  3. Step 3: Cross multiply
    129.65x = 193.69 × 121.11
  4. Step 4: Simplify right side
    129.65x = 23,457.22
  5. Step 5: Solve for x
    x = 23,457.22/129.65
  6. Step 6: Final answer
    x = 180.93

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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.