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Finding the Fourth Proportional to 1,321.62, 1,982.42 and 860.52

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Solution

The fourth proportional to 1,321.62, 1,982.42 and 860.52 is: 1,290.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.62 : 1,982.42 = 860.52 : x
  2. Step 2: Convert to fraction form
    1,321.62/1,982.42 = 860.52/x
  3. Step 3: Cross multiply
    1,321.62x = 1,982.42 × 860.52
  4. Step 4: Simplify right side
    1,321.62x = 1,705,912.06
  5. Step 5: Solve for x
    x = 1,705,912.06/1,321.62
  6. Step 6: Final answer
    x = 1,290.77

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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.