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Finding the Fourth Proportional to 1,329.44, 1,995.19 and 921.44

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Solution

The fourth proportional to 1,329.44, 1,995.19 and 921.44 is: 1,382.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.44 : 1,995.19 = 921.44 : x
  2. Step 2: Convert to fraction form
    1,329.44/1,995.19 = 921.44/x
  3. Step 3: Cross multiply
    1,329.44x = 1,995.19 × 921.44
  4. Step 4: Simplify right side
    1,329.44x = 1,838,447.87
  5. Step 5: Solve for x
    x = 1,838,447.87/1,329.44
  6. Step 6: Final answer
    x = 1,382.87

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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.