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Finding the Fourth Proportional to 140.15, 193.40 and 77.98

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Solution

The fourth proportional to 140.15, 193.40 and 77.98 is: 107.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.15 : 193.40 = 77.98 : x
  2. Step 2: Convert to fraction form
    140.15/193.40 = 77.98/x
  3. Step 3: Cross multiply
    140.15x = 193.40 × 77.98
  4. Step 4: Simplify right side
    140.15x = 15,081.33
  5. Step 5: Solve for x
    x = 15,081.33/140.15
  6. Step 6: Final answer
    x = 107.61

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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.