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Finding the Fourth Proportional to 199.95, 300.15 and 118.86

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Solution

The fourth proportional to 199.95, 300.15 and 118.86 is: 178.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.95 : 300.15 = 118.86 : x
  2. Step 2: Convert to fraction form
    199.95/300.15 = 118.86/x
  3. Step 3: Cross multiply
    199.95x = 300.15 × 118.86
  4. Step 4: Simplify right side
    199.95x = 35,675.83
  5. Step 5: Solve for x
    x = 35,675.83/199.95
  6. Step 6: Final answer
    x = 178.42

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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.