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Finding the Fourth Proportional to 1,321.02, 1,980.21 and 663.37

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Solution

The fourth proportional to 1,321.02, 1,980.21 and 663.37 is: 994.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.02 : 1,980.21 = 663.37 : x
  2. Step 2: Convert to fraction form
    1,321.02/1,980.21 = 663.37/x
  3. Step 3: Cross multiply
    1,321.02x = 1,980.21 × 663.37
  4. Step 4: Simplify right side
    1,321.02x = 1,313,602.01
  5. Step 5: Solve for x
    x = 1,313,602.01/1,321.02
  6. Step 6: Final answer
    x = 994.38

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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.