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Finding the Fourth Proportional to 81.89, 122.89 and 56.23

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Solution

The fourth proportional to 81.89, 122.89 and 56.23 is: 84.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.89 : 122.89 = 56.23 : x
  2. Step 2: Convert to fraction form
    81.89/122.89 = 56.23/x
  3. Step 3: Cross multiply
    81.89x = 122.89 × 56.23
  4. Step 4: Simplify right side
    81.89x = 6,910.37
  5. Step 5: Solve for x
    x = 6,910.37/81.89
  6. Step 6: Final answer
    x = 84.39

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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.