Home / 1,981.20-2,733.18-1,392.12

Finding the Fourth Proportional to 1,981.20, 2,733.18 and 1,392.12

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Solution

The fourth proportional to 1,981.20, 2,733.18 and 1,392.12 is: 1,920.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.20 : 2,733.18 = 1,392.12 : x
  2. Step 2: Convert to fraction form
    1,981.20/2,733.18 = 1,392.12/x
  3. Step 3: Cross multiply
    1,981.20x = 2,733.18 × 1,392.12
  4. Step 4: Simplify right side
    1,981.20x = 3,804,914.54
  5. Step 5: Solve for x
    x = 3,804,914.54/1,981.20
  6. Step 6: Final answer
    x = 1,920.51

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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.