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Finding the Fourth Proportional to 265.69, 398.44 and 80.56

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Solution

The fourth proportional to 265.69, 398.44 and 80.56 is: 120.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.69 : 398.44 = 80.56 : x
  2. Step 2: Convert to fraction form
    265.69/398.44 = 80.56/x
  3. Step 3: Cross multiply
    265.69x = 398.44 × 80.56
  4. Step 4: Simplify right side
    265.69x = 32,098.33
  5. Step 5: Solve for x
    x = 32,098.33/265.69
  6. Step 6: Final answer
    x = 120.81

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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.