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Finding the Fourth Proportional to 980.36, 1,469.80 and 845

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Solution

The fourth proportional to 980.36, 1,469.80 and 845 is: 1,266.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.36 : 1,469.80 = 845 : x
  2. Step 2: Convert to fraction form
    980.36/1,469.80 = 845/x
  3. Step 3: Cross multiply
    980.36x = 1,469.80 × 845
  4. Step 4: Simplify right side
    980.36x = 1,241,981
  5. Step 5: Solve for x
    x = 1,241,981/980.36
  6. Step 6: Final answer
    x = 1,266.86

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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.