Home / 2,021.20-3,031.80-1,992.40

Finding the Fourth Proportional to 2,021.20, 3,031.80 and 1,992.40

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Solution

The fourth proportional to 2,021.20, 3,031.80 and 1,992.40 is: 2,988.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,021.20 : 3,031.80 = 1,992.40 : x
  2. Step 2: Convert to fraction form
    2,021.20/3,031.80 = 1,992.40/x
  3. Step 3: Cross multiply
    2,021.20x = 3,031.80 × 1,992.40
  4. Step 4: Simplify right side
    2,021.20x = 6,040,558.32
  5. Step 5: Solve for x
    x = 6,040,558.32/2,021.20
  6. Step 6: Final answer
    x = 2,988.60

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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.