Home / 2,991.85-4,129.23-2,155.35

Finding the Fourth Proportional to 2,991.85, 4,129.23 and 2,155.35

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Solution

The fourth proportional to 2,991.85, 4,129.23 and 2,155.35 is: 2,974.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.85 : 4,129.23 = 2,155.35 : x
  2. Step 2: Convert to fraction form
    2,991.85/4,129.23 = 2,155.35/x
  3. Step 3: Cross multiply
    2,991.85x = 4,129.23 × 2,155.35
  4. Step 4: Simplify right side
    2,991.85x = 8,899,935.88
  5. Step 5: Solve for x
    x = 8,899,935.88/2,991.85
  6. Step 6: Final answer
    x = 2,974.73

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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.