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Finding the Fourth Proportional to 660, 989.96 and 443.44

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Solution

The fourth proportional to 660, 989.96 and 443.44 is: 665.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    660 : 989.96 = 443.44 : x
  2. Step 2: Convert to fraction form
    660/989.96 = 443.44/x
  3. Step 3: Cross multiply
    660x = 989.96 × 443.44
  4. Step 4: Simplify right side
    660x = 438,987.86
  5. Step 5: Solve for x
    x = 438,987.86/660
  6. Step 6: Final answer
    x = 665.13

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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.