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Finding the Fourth Proportional to 80.54, 111.09 and 62.09

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Solution

The fourth proportional to 80.54, 111.09 and 62.09 is: 85.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.54 : 111.09 = 62.09 : x
  2. Step 2: Convert to fraction form
    80.54/111.09 = 62.09/x
  3. Step 3: Cross multiply
    80.54x = 111.09 × 62.09
  4. Step 4: Simplify right side
    80.54x = 6,897.86
  5. Step 5: Solve for x
    x = 6,897.86/80.54
  6. Step 6: Final answer
    x = 85.64

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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.