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Finding the Fourth Proportional to 99.91, 150.08 and 80.67

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Solution

The fourth proportional to 99.91, 150.08 and 80.67 is: 121.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.91 : 150.08 = 80.67 : x
  2. Step 2: Convert to fraction form
    99.91/150.08 = 80.67/x
  3. Step 3: Cross multiply
    99.91x = 150.08 × 80.67
  4. Step 4: Simplify right side
    99.91x = 12,107.11
  5. Step 5: Solve for x
    x = 12,107.11/99.91
  6. Step 6: Final answer
    x = 121.18

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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.