Home / 1,998.12-2,758.80-1,601.40

Finding the Fourth Proportional to 1,998.12, 2,758.80 and 1,601.40

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Solution

The fourth proportional to 1,998.12, 2,758.80 and 1,601.40 is: 2,211.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.12 : 2,758.80 = 1,601.40 : x
  2. Step 2: Convert to fraction form
    1,998.12/2,758.80 = 1,601.40/x
  3. Step 3: Cross multiply
    1,998.12x = 2,758.80 × 1,601.40
  4. Step 4: Simplify right side
    1,998.12x = 4,417,942.32
  5. Step 5: Solve for x
    x = 4,417,942.32/1,998.12
  6. Step 6: Final answer
    x = 2,211.05

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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.