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Finding the Fourth Proportional to 194.09, 291.20 and 78.55

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Solution

The fourth proportional to 194.09, 291.20 and 78.55 is: 117.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.09 : 291.20 = 78.55 : x
  2. Step 2: Convert to fraction form
    194.09/291.20 = 78.55/x
  3. Step 3: Cross multiply
    194.09x = 291.20 × 78.55
  4. Step 4: Simplify right side
    194.09x = 22,872.64
  5. Step 5: Solve for x
    x = 22,872.64/194.09
  6. Step 6: Final answer
    x = 117.85

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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.