Home / 1,938.54-2,672.44-1,378.80

Finding the Fourth Proportional to 1,938.54, 2,672.44 and 1,378.80

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Solution

The fourth proportional to 1,938.54, 2,672.44 and 1,378.80 is: 1,900.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,938.54 : 2,672.44 = 1,378.80 : x
  2. Step 2: Convert to fraction form
    1,938.54/2,672.44 = 1,378.80/x
  3. Step 3: Cross multiply
    1,938.54x = 2,672.44 × 1,378.80
  4. Step 4: Simplify right side
    1,938.54x = 3,684,760.27
  5. Step 5: Solve for x
    x = 3,684,760.27/1,938.54
  6. Step 6: Final answer
    x = 1,900.79

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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.