Home / 1,980.75-2,730.95-1,271.34

Finding the Fourth Proportional to 1,980.75, 2,730.95 and 1,271.34

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Solution

The fourth proportional to 1,980.75, 2,730.95 and 1,271.34 is: 1,752.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.75 : 2,730.95 = 1,271.34 : x
  2. Step 2: Convert to fraction form
    1,980.75/2,730.95 = 1,271.34/x
  3. Step 3: Cross multiply
    1,980.75x = 2,730.95 × 1,271.34
  4. Step 4: Simplify right side
    1,980.75x = 3,471,965.97
  5. Step 5: Solve for x
    x = 3,471,965.97/1,980.75
  6. Step 6: Final answer
    x = 1,752.85

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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.