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Finding the Fourth Proportional to 121.99, 183.10 and 81.47

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Solution

The fourth proportional to 121.99, 183.10 and 81.47 is: 122.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.99 : 183.10 = 81.47 : x
  2. Step 2: Convert to fraction form
    121.99/183.10 = 81.47/x
  3. Step 3: Cross multiply
    121.99x = 183.10 × 81.47
  4. Step 4: Simplify right side
    121.99x = 14,917.16
  5. Step 5: Solve for x
    x = 14,917.16/121.99
  6. Step 6: Final answer
    x = 122.28

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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.