Home / 3,109.20-4,288.80-1,989.74

Finding the Fourth Proportional to 3,109.20, 4,288.80 and 1,989.74

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Solution

The fourth proportional to 3,109.20, 4,288.80 and 1,989.74 is: 2,744.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.20 : 4,288.80 = 1,989.74 : x
  2. Step 2: Convert to fraction form
    3,109.20/4,288.80 = 1,989.74/x
  3. Step 3: Cross multiply
    3,109.20x = 4,288.80 × 1,989.74
  4. Step 4: Simplify right side
    3,109.20x = 8,533,596.91
  5. Step 5: Solve for x
    x = 8,533,596.91/3,109.20
  6. Step 6: Final answer
    x = 2,744.63

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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.