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Finding the Fourth Proportional to 111.98, 168.08 and 51.08

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Solution

The fourth proportional to 111.98, 168.08 and 51.08 is: 76.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.98 : 168.08 = 51.08 : x
  2. Step 2: Convert to fraction form
    111.98/168.08 = 51.08/x
  3. Step 3: Cross multiply
    111.98x = 168.08 × 51.08
  4. Step 4: Simplify right side
    111.98x = 8,585.38
  5. Step 5: Solve for x
    x = 8,585.38/111.98
  6. Step 6: Final answer
    x = 76.67

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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.