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Finding the Fourth Proportional to 192.20, 265.21 and 109.31

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Solution

The fourth proportional to 192.20, 265.21 and 109.31 is: 150.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.20 : 265.21 = 109.31 : x
  2. Step 2: Convert to fraction form
    192.20/265.21 = 109.31/x
  3. Step 3: Cross multiply
    192.20x = 265.21 × 109.31
  4. Step 4: Simplify right side
    192.20x = 28,990.11
  5. Step 5: Solve for x
    x = 28,990.11/192.20
  6. Step 6: Final answer
    x = 150.83

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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.