Home / 1,393.20-1,922.94-1,021.41

Finding the Fourth Proportional to 1,393.20, 1,922.94 and 1,021.41

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Solution

The fourth proportional to 1,393.20, 1,922.94 and 1,021.41 is: 1,409.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.20 : 1,922.94 = 1,021.41 : x
  2. Step 2: Convert to fraction form
    1,393.20/1,922.94 = 1,021.41/x
  3. Step 3: Cross multiply
    1,393.20x = 1,922.94 × 1,021.41
  4. Step 4: Simplify right side
    1,393.20x = 1,964,110.15
  5. Step 5: Solve for x
    x = 1,964,110.15/1,393.20
  6. Step 6: Final answer
    x = 1,409.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.