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Finding the Fourth Proportional to 1,091.54, 1,505.17 and 811.32

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Solution

The fourth proportional to 1,091.54, 1,505.17 and 811.32 is: 1,118.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.54 : 1,505.17 = 811.32 : x
  2. Step 2: Convert to fraction form
    1,091.54/1,505.17 = 811.32/x
  3. Step 3: Cross multiply
    1,091.54x = 1,505.17 × 811.32
  4. Step 4: Simplify right side
    1,091.54x = 1,221,165.33
  5. Step 5: Solve for x
    x = 1,221,165.33/1,091.54
  6. Step 6: Final answer
    x = 1,118.75

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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.