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Finding the Fourth Proportional to 199.19, 298.80 and 77.47

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Solution

The fourth proportional to 199.19, 298.80 and 77.47 is: 116.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.19 : 298.80 = 77.47 : x
  2. Step 2: Convert to fraction form
    199.19/298.80 = 77.47/x
  3. Step 3: Cross multiply
    199.19x = 298.80 × 77.47
  4. Step 4: Simplify right side
    199.19x = 23,147.29
  5. Step 5: Solve for x
    x = 23,147.29/199.19
  6. Step 6: Final answer
    x = 116.21

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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.