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Finding the Fourth Proportional to 192.80, 266.06 and 115.20

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Solution

The fourth proportional to 192.80, 266.06 and 115.20 is: 158.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.80 : 266.06 = 115.20 : x
  2. Step 2: Convert to fraction form
    192.80/266.06 = 115.20/x
  3. Step 3: Cross multiply
    192.80x = 266.06 × 115.20
  4. Step 4: Simplify right side
    192.80x = 30,650.11
  5. Step 5: Solve for x
    x = 30,650.11/192.80
  6. Step 6: Final answer
    x = 158.97

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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.