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Finding the Fourth Proportional to 122.99, 184.65 and 86.33

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Solution

The fourth proportional to 122.99, 184.65 and 86.33 is: 129.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.99 : 184.65 = 86.33 : x
  2. Step 2: Convert to fraction form
    122.99/184.65 = 86.33/x
  3. Step 3: Cross multiply
    122.99x = 184.65 × 86.33
  4. Step 4: Simplify right side
    122.99x = 15,940.97
  5. Step 5: Solve for x
    x = 15,940.97/122.99
  6. Step 6: Final answer
    x = 129.62

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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.