Home / 1,980.36-2,734.58-1,392.20

Finding the Fourth Proportional to 1,980.36, 2,734.58 and 1,392.20

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Solution

The fourth proportional to 1,980.36, 2,734.58 and 1,392.20 is: 1,922.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.36 : 2,734.58 = 1,392.20 : x
  2. Step 2: Convert to fraction form
    1,980.36/2,734.58 = 1,392.20/x
  3. Step 3: Cross multiply
    1,980.36x = 2,734.58 × 1,392.20
  4. Step 4: Simplify right side
    1,980.36x = 3,807,082.28
  5. Step 5: Solve for x
    x = 3,807,082.28/1,980.36
  6. Step 6: Final answer
    x = 1,922.42

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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.