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Finding the Fourth Proportional to 1,328.49, 1,993.28 and 1,293.21

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Solution

The fourth proportional to 1,328.49, 1,993.28 and 1,293.21 is: 1,940.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.49 : 1,993.28 = 1,293.21 : x
  2. Step 2: Convert to fraction form
    1,328.49/1,993.28 = 1,293.21/x
  3. Step 3: Cross multiply
    1,328.49x = 1,993.28 × 1,293.21
  4. Step 4: Simplify right side
    1,328.49x = 2,577,729.63
  5. Step 5: Solve for x
    x = 2,577,729.63/1,328.49
  6. Step 6: Final answer
    x = 1,940.35

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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.