Home / 2,970.38-4,100.49-2,120.30

Finding the Fourth Proportional to 2,970.38, 4,100.49 and 2,120.30

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Solution

The fourth proportional to 2,970.38, 4,100.49 and 2,120.30 is: 2,926.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,970.38 : 4,100.49 = 2,120.30 : x
  2. Step 2: Convert to fraction form
    2,970.38/4,100.49 = 2,120.30/x
  3. Step 3: Cross multiply
    2,970.38x = 4,100.49 × 2,120.30
  4. Step 4: Simplify right side
    2,970.38x = 8,694,268.95
  5. Step 5: Solve for x
    x = 8,694,268.95/2,970.38
  6. Step 6: Final answer
    x = 2,926.99

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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.