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Finding the Fourth Proportional to 129.93, 194.64 and 108.21

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Solution

The fourth proportional to 129.93, 194.64 and 108.21 is: 162.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.93 : 194.64 = 108.21 : x
  2. Step 2: Convert to fraction form
    129.93/194.64 = 108.21/x
  3. Step 3: Cross multiply
    129.93x = 194.64 × 108.21
  4. Step 4: Simplify right side
    129.93x = 21,061.99
  5. Step 5: Solve for x
    x = 21,061.99/129.93
  6. Step 6: Final answer
    x = 162.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.