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Finding the Fourth Proportional to 1,336.36, 1,990.44 and 1,267

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Solution

The fourth proportional to 1,336.36, 1,990.44 and 1,267 is: 1,887.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,336.36 : 1,990.44 = 1,267 : x
  2. Step 2: Convert to fraction form
    1,336.36/1,990.44 = 1,267/x
  3. Step 3: Cross multiply
    1,336.36x = 1,990.44 × 1,267
  4. Step 4: Simplify right side
    1,336.36x = 2,521,887.48
  5. Step 5: Solve for x
    x = 2,521,887.48/1,336.36
  6. Step 6: Final answer
    x = 1,887.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.