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Finding the Fourth Proportional to 1,091.26, 1,504.78 and 811.04

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Solution

The fourth proportional to 1,091.26, 1,504.78 and 811.04 is: 1,118.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.26 : 1,504.78 = 811.04 : x
  2. Step 2: Convert to fraction form
    1,091.26/1,504.78 = 811.04/x
  3. Step 3: Cross multiply
    1,091.26x = 1,504.78 × 811.04
  4. Step 4: Simplify right side
    1,091.26x = 1,220,427.22
  5. Step 5: Solve for x
    x = 1,220,427.22/1,091.26
  6. Step 6: Final answer
    x = 1,118.36

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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.