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Finding the Fourth Proportional to 1,321.49, 1,980.68 and 736.22

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Solution

The fourth proportional to 1,321.49, 1,980.68 and 736.22 is: 1,103.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.49 : 1,980.68 = 736.22 : x
  2. Step 2: Convert to fraction form
    1,321.49/1,980.68 = 736.22/x
  3. Step 3: Cross multiply
    1,321.49x = 1,980.68 × 736.22
  4. Step 4: Simplify right side
    1,321.49x = 1,458,202.65
  5. Step 5: Solve for x
    x = 1,458,202.65/1,321.49
  6. Step 6: Final answer
    x = 1,103.46

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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.