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Finding the Fourth Proportional to 194.26, 291.38 and 78.70

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Solution

The fourth proportional to 194.26, 291.38 and 78.70 is: 118.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.26 : 291.38 = 78.70 : x
  2. Step 2: Convert to fraction form
    194.26/291.38 = 78.70/x
  3. Step 3: Cross multiply
    194.26x = 291.38 × 78.70
  4. Step 4: Simplify right side
    194.26x = 22,932.27
  5. Step 5: Solve for x
    x = 22,932.27/194.26
  6. Step 6: Final answer
    x = 118.05

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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.