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Finding the Fourth Proportional to 991.18, 1,486.56 and 443.22

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Solution

The fourth proportional to 991.18, 1,486.56 and 443.22 is: 664.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.18 : 1,486.56 = 443.22 : x
  2. Step 2: Convert to fraction form
    991.18/1,486.56 = 443.22/x
  3. Step 3: Cross multiply
    991.18x = 1,486.56 × 443.22
  4. Step 4: Simplify right side
    991.18x = 658,873.12
  5. Step 5: Solve for x
    x = 658,873.12/991.18
  6. Step 6: Final answer
    x = 664.74

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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.