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Finding the Fourth Proportional to 140.29, 193.60 and 78.12

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Solution

The fourth proportional to 140.29, 193.60 and 78.12 is: 107.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.29 : 193.60 = 78.12 : x
  2. Step 2: Convert to fraction form
    140.29/193.60 = 78.12/x
  3. Step 3: Cross multiply
    140.29x = 193.60 × 78.12
  4. Step 4: Simplify right side
    140.29x = 15,124.45
  5. Step 5: Solve for x
    x = 15,124.45/140.29
  6. Step 6: Final answer
    x = 107.81

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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.