Home / 2,990.80-4,128.60-2,051.20

Finding the Fourth Proportional to 2,990.80, 4,128.60 and 2,051.20

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Solution

The fourth proportional to 2,990.80, 4,128.60 and 2,051.20 is: 2,831.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.80 : 4,128.60 = 2,051.20 : x
  2. Step 2: Convert to fraction form
    2,990.80/4,128.60 = 2,051.20/x
  3. Step 3: Cross multiply
    2,990.80x = 4,128.60 × 2,051.20
  4. Step 4: Simplify right side
    2,990.80x = 8,468,584.32
  5. Step 5: Solve for x
    x = 8,468,584.32/2,990.80
  6. Step 6: Final answer
    x = 2,831.54

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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.