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Finding the Fourth Proportional to 129.84, 194.55 and 68.91

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Solution

The fourth proportional to 129.84, 194.55 and 68.91 is: 103.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.84 : 194.55 = 68.91 : x
  2. Step 2: Convert to fraction form
    129.84/194.55 = 68.91/x
  3. Step 3: Cross multiply
    129.84x = 194.55 × 68.91
  4. Step 4: Simplify right side
    129.84x = 13,406.44
  5. Step 5: Solve for x
    x = 13,406.44/129.84
  6. Step 6: Final answer
    x = 103.25

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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.