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Finding the Fourth Proportional to 991.36, 1,486.88 and 443.44

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Solution

The fourth proportional to 991.36, 1,486.88 and 443.44 is: 665.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.36 : 1,486.88 = 443.44 : x
  2. Step 2: Convert to fraction form
    991.36/1,486.88 = 443.44/x
  3. Step 3: Cross multiply
    991.36x = 1,486.88 × 443.44
  4. Step 4: Simplify right side
    991.36x = 659,343.37
  5. Step 5: Solve for x
    x = 659,343.37/991.36
  6. Step 6: Final answer
    x = 665.09

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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.