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Finding the Fourth Proportional to 989.56, 1,481.79 and 960.37

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Solution

The fourth proportional to 989.56, 1,481.79 and 960.37 is: 1,438.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.56 : 1,481.79 = 960.37 : x
  2. Step 2: Convert to fraction form
    989.56/1,481.79 = 960.37/x
  3. Step 3: Cross multiply
    989.56x = 1,481.79 × 960.37
  4. Step 4: Simplify right side
    989.56x = 1,423,066.66
  5. Step 5: Solve for x
    x = 1,423,066.66/989.56
  6. Step 6: Final answer
    x = 1,438.08

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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.