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Finding the Fourth Proportional to 140.63, 194.05 and 78.44

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Solution

The fourth proportional to 140.63, 194.05 and 78.44 is: 108.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.63 : 194.05 = 78.44 : x
  2. Step 2: Convert to fraction form
    140.63/194.05 = 78.44/x
  3. Step 3: Cross multiply
    140.63x = 194.05 × 78.44
  4. Step 4: Simplify right side
    140.63x = 15,220.41
  5. Step 5: Solve for x
    x = 15,220.41/140.63
  6. Step 6: Final answer
    x = 108.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.