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Finding the Fourth Proportional to 194.49, 291.72 and 78.99

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Solution

The fourth proportional to 194.49, 291.72 and 78.99 is: 118.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.49 : 291.72 = 78.99 : x
  2. Step 2: Convert to fraction form
    194.49/291.72 = 78.99/x
  3. Step 3: Cross multiply
    194.49x = 291.72 × 78.99
  4. Step 4: Simplify right side
    194.49x = 23,042.96
  5. Step 5: Solve for x
    x = 23,042.96/194.49
  6. Step 6: Final answer
    x = 118.48

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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.