Home / 2,121.08-3,178.95-1,081.34

Finding the Fourth Proportional to 2,121.08, 3,178.95 and 1,081.34

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Solution

The fourth proportional to 2,121.08, 3,178.95 and 1,081.34 is: 1,620.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.08 : 3,178.95 = 1,081.34 : x
  2. Step 2: Convert to fraction form
    2,121.08/3,178.95 = 1,081.34/x
  3. Step 3: Cross multiply
    2,121.08x = 3,178.95 × 1,081.34
  4. Step 4: Simplify right side
    2,121.08x = 3,437,509.90
  5. Step 5: Solve for x
    x = 3,437,509.90/2,121.08
  6. Step 6: Final answer
    x = 1,620.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.