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Finding the Fourth Proportional to 199.15, 298.61 and 90.83

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Solution

The fourth proportional to 199.15, 298.61 and 90.83 is: 136.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.15 : 298.61 = 90.83 : x
  2. Step 2: Convert to fraction form
    199.15/298.61 = 90.83/x
  3. Step 3: Cross multiply
    199.15x = 298.61 × 90.83
  4. Step 4: Simplify right side
    199.15x = 27,123.38
  5. Step 5: Solve for x
    x = 27,123.38/199.15
  6. Step 6: Final answer
    x = 136.20

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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.