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Finding the Fourth Proportional to 1,324.92, 1,998.95 and 1,321.28

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Solution

The fourth proportional to 1,324.92, 1,998.95 and 1,321.28 is: 1,993.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,324.92 : 1,998.95 = 1,321.28 : x
  2. Step 2: Convert to fraction form
    1,324.92/1,998.95 = 1,321.28/x
  3. Step 3: Cross multiply
    1,324.92x = 1,998.95 × 1,321.28
  4. Step 4: Simplify right side
    1,324.92x = 2,641,156.05
  5. Step 5: Solve for x
    x = 2,641,156.05/1,324.92
  6. Step 6: Final answer
    x = 1,993.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.