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Finding the Fourth Proportional to 1,414.56, 2,121.90 and 388.56

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Solution

The fourth proportional to 1,414.56, 2,121.90 and 388.56 is: 582.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,414.56 : 2,121.90 = 388.56 : x
  2. Step 2: Convert to fraction form
    1,414.56/2,121.90 = 388.56/x
  3. Step 3: Cross multiply
    1,414.56x = 2,121.90 × 388.56
  4. Step 4: Simplify right side
    1,414.56x = 824,485.46
  5. Step 5: Solve for x
    x = 824,485.46/1,414.56
  6. Step 6: Final answer
    x = 582.86

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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.