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Finding the Fourth Proportional to 199.26, 298.90 and 77.45

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Solution

The fourth proportional to 199.26, 298.90 and 77.45 is: 116.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.26 : 298.90 = 77.45 : x
  2. Step 2: Convert to fraction form
    199.26/298.90 = 77.45/x
  3. Step 3: Cross multiply
    199.26x = 298.90 × 77.45
  4. Step 4: Simplify right side
    199.26x = 23,150.36
  5. Step 5: Solve for x
    x = 23,150.36/199.26
  6. Step 6: Final answer
    x = 116.18

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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.