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Finding the Fourth Proportional to 192.80, 266.05 and 109.91

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Solution

The fourth proportional to 192.80, 266.05 and 109.91 is: 151.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.80 : 266.05 = 109.91 : x
  2. Step 2: Convert to fraction form
    192.80/266.05 = 109.91/x
  3. Step 3: Cross multiply
    192.80x = 266.05 × 109.91
  4. Step 4: Simplify right side
    192.80x = 29,241.92
  5. Step 5: Solve for x
    x = 29,241.92/192.80
  6. Step 6: Final answer
    x = 151.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.