Home / 2,169.60-2,990.16-2,139.36

Finding the Fourth Proportional to 2,169.60, 2,990.16 and 2,139.36

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Solution

The fourth proportional to 2,169.60, 2,990.16 and 2,139.36 is: 2,948.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,169.60 : 2,990.16 = 2,139.36 : x
  2. Step 2: Convert to fraction form
    2,169.60/2,990.16 = 2,139.36/x
  3. Step 3: Cross multiply
    2,169.60x = 2,990.16 × 2,139.36
  4. Step 4: Simplify right side
    2,169.60x = 6,397,028.70
  5. Step 5: Solve for x
    x = 6,397,028.70/2,169.60
  6. Step 6: Final answer
    x = 2,948.48

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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.