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Finding the Fourth Proportional to 194.11, 289.43 and 172.64

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Solution

The fourth proportional to 194.11, 289.43 and 172.64 is: 257.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.11 : 289.43 = 172.64 : x
  2. Step 2: Convert to fraction form
    194.11/289.43 = 172.64/x
  3. Step 3: Cross multiply
    194.11x = 289.43 × 172.64
  4. Step 4: Simplify right side
    194.11x = 49,967.70
  5. Step 5: Solve for x
    x = 49,967.70/194.11
  6. Step 6: Final answer
    x = 257.42

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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.