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Finding the Fourth Proportional to 989.44, 1,365.44 and 640.73

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Solution

The fourth proportional to 989.44, 1,365.44 and 640.73 is: 884.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.44 : 1,365.44 = 640.73 : x
  2. Step 2: Convert to fraction form
    989.44/1,365.44 = 640.73/x
  3. Step 3: Cross multiply
    989.44x = 1,365.44 × 640.73
  4. Step 4: Simplify right side
    989.44x = 874,878.58
  5. Step 5: Solve for x
    x = 874,878.58/989.44
  6. Step 6: Final answer
    x = 884.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.