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Finding the Fourth Proportional to 804.25, 1,205.79 and 543.60

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Solution

The fourth proportional to 804.25, 1,205.79 and 543.60 is: 815.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.25 : 1,205.79 = 543.60 : x
  2. Step 2: Convert to fraction form
    804.25/1,205.79 = 543.60/x
  3. Step 3: Cross multiply
    804.25x = 1,205.79 × 543.60
  4. Step 4: Simplify right side
    804.25x = 655,467.44
  5. Step 5: Solve for x
    x = 655,467.44/804.25
  6. Step 6: Final answer
    x = 815.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.