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Finding the Fourth Proportional to 1,205.90, 1,664.91 and 828.41

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Solution

The fourth proportional to 1,205.90, 1,664.91 and 828.41 is: 1,143.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.90 : 1,664.91 = 828.41 : x
  2. Step 2: Convert to fraction form
    1,205.90/1,664.91 = 828.41/x
  3. Step 3: Cross multiply
    1,205.90x = 1,664.91 × 828.41
  4. Step 4: Simplify right side
    1,205.90x = 1,379,232.26
  5. Step 5: Solve for x
    x = 1,379,232.26/1,205.90
  6. Step 6: Final answer
    x = 1,143.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.