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Finding the Fourth Proportional to 991.22, 1,487.21 and 443.01

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Solution

The fourth proportional to 991.22, 1,487.21 and 443.01 is: 664.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.22 : 1,487.21 = 443.01 : x
  2. Step 2: Convert to fraction form
    991.22/1,487.21 = 443.01/x
  3. Step 3: Cross multiply
    991.22x = 1,487.21 × 443.01
  4. Step 4: Simplify right side
    991.22x = 658,846.69
  5. Step 5: Solve for x
    x = 658,846.69/991.22
  6. Step 6: Final answer
    x = 664.69

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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.