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Finding the Fourth Proportional to 80.58, 111.45 and 72.39

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Solution

The fourth proportional to 80.58, 111.45 and 72.39 is: 100.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.58 : 111.45 = 72.39 : x
  2. Step 2: Convert to fraction form
    80.58/111.45 = 72.39/x
  3. Step 3: Cross multiply
    80.58x = 111.45 × 72.39
  4. Step 4: Simplify right side
    80.58x = 8,067.87
  5. Step 5: Solve for x
    x = 8,067.87/80.58
  6. Step 6: Final answer
    x = 100.12

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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.