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Finding the Fourth Proportional to 804.27, 1,109 and 636.60

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Solution

The fourth proportional to 804.27, 1,109 and 636.60 is: 877.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.27 : 1,109 = 636.60 : x
  2. Step 2: Convert to fraction form
    804.27/1,109 = 636.60/x
  3. Step 3: Cross multiply
    804.27x = 1,109 × 636.60
  4. Step 4: Simplify right side
    804.27x = 705,989.40
  5. Step 5: Solve for x
    x = 705,989.40/804.27
  6. Step 6: Final answer
    x = 877.80

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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.