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Finding the Fourth Proportional to 811.26, 1,119.56 and 634.43

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Solution

The fourth proportional to 811.26, 1,119.56 and 634.43 is: 875.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.26 : 1,119.56 = 634.43 : x
  2. Step 2: Convert to fraction form
    811.26/1,119.56 = 634.43/x
  3. Step 3: Cross multiply
    811.26x = 1,119.56 × 634.43
  4. Step 4: Simplify right side
    811.26x = 710,282.08
  5. Step 5: Solve for x
    x = 710,282.08/811.26
  6. Step 6: Final answer
    x = 875.53

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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.