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Finding the Fourth Proportional to 1,414.80, 2,121.96 and 388.80

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Solution

The fourth proportional to 1,414.80, 2,121.96 and 388.80 is: 583.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,414.80 : 2,121.96 = 388.80 : x
  2. Step 2: Convert to fraction form
    1,414.80/2,121.96 = 388.80/x
  3. Step 3: Cross multiply
    1,414.80x = 2,121.96 × 388.80
  4. Step 4: Simplify right side
    1,414.80x = 825,018.05
  5. Step 5: Solve for x
    x = 825,018.05/1,414.80
  6. Step 6: Final answer
    x = 583.13

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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.