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Finding the Fourth Proportional to 991.08, 1,485.41 and 443.25

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Solution

The fourth proportional to 991.08, 1,485.41 and 443.25 is: 664.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.08 : 1,485.41 = 443.25 : x
  2. Step 2: Convert to fraction form
    991.08/1,485.41 = 443.25/x
  3. Step 3: Cross multiply
    991.08x = 1,485.41 × 443.25
  4. Step 4: Simplify right side
    991.08x = 658,405.77
  5. Step 5: Solve for x
    x = 658,405.77/991.08
  6. Step 6: Final answer
    x = 664.33

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Double scale
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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.