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Finding the Fourth Proportional to 80.69, 111.24 and 72.59

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Solution

The fourth proportional to 80.69, 111.24 and 72.59 is: 100.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.69 : 111.24 = 72.59 : x
  2. Step 2: Convert to fraction form
    80.69/111.24 = 72.59/x
  3. Step 3: Cross multiply
    80.69x = 111.24 × 72.59
  4. Step 4: Simplify right side
    80.69x = 8,074.36
  5. Step 5: Solve for x
    x = 8,074.36/80.69
  6. Step 6: Final answer
    x = 100.07

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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.