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Finding the Fourth Proportional to 989.24, 1,481.22 and 919.58

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Solution

The fourth proportional to 989.24, 1,481.22 and 919.58 is: 1,376.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.24 : 1,481.22 = 919.58 : x
  2. Step 2: Convert to fraction form
    989.24/1,481.22 = 919.58/x
  3. Step 3: Cross multiply
    989.24x = 1,481.22 × 919.58
  4. Step 4: Simplify right side
    989.24x = 1,362,092.88
  5. Step 5: Solve for x
    x = 1,362,092.88/989.24
  6. Step 6: Final answer
    x = 1,376.92

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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.