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Finding the Fourth Proportional to 3,959, 5,939.46 and 1,223

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Solution

The fourth proportional to 3,959, 5,939.46 and 1,223 is: 1,834.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,959 : 5,939.46 = 1,223 : x
  2. Step 2: Convert to fraction form
    3,959/5,939.46 = 1,223/x
  3. Step 3: Cross multiply
    3,959x = 5,939.46 × 1,223
  4. Step 4: Simplify right side
    3,959x = 7,263,959.58
  5. Step 5: Solve for x
    x = 7,263,959.58/3,959
  6. Step 6: Final answer
    x = 1,834.80

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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.