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Finding the Fourth Proportional to 262.66, 393.99 and 80.06

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Solution

The fourth proportional to 262.66, 393.99 and 80.06 is: 120.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.66 : 393.99 = 80.06 : x
  2. Step 2: Convert to fraction form
    262.66/393.99 = 80.06/x
  3. Step 3: Cross multiply
    262.66x = 393.99 × 80.06
  4. Step 4: Simplify right side
    262.66x = 31,540.87
  5. Step 5: Solve for x
    x = 31,540.87/262.66
  6. Step 6: Final answer
    x = 120.08

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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.