Home / 2,019.80-2,788.56-1,391.45

Finding the Fourth Proportional to 2,019.80, 2,788.56 and 1,391.45

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Solution

The fourth proportional to 2,019.80, 2,788.56 and 1,391.45 is: 1,921.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,019.80 : 2,788.56 = 1,391.45 : x
  2. Step 2: Convert to fraction form
    2,019.80/2,788.56 = 1,391.45/x
  3. Step 3: Cross multiply
    2,019.80x = 2,788.56 × 1,391.45
  4. Step 4: Simplify right side
    2,019.80x = 3,880,127.87
  5. Step 5: Solve for x
    x = 3,880,127.87/2,019.80
  6. Step 6: Final answer
    x = 1,921.04

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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.