Home / 2,989.80-4,129.86-2,289.96

Finding the Fourth Proportional to 2,989.80, 4,129.86 and 2,289.96

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Solution

The fourth proportional to 2,989.80, 4,129.86 and 2,289.96 is: 3,163.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,989.80 : 4,129.86 = 2,289.96 : x
  2. Step 2: Convert to fraction form
    2,989.80/4,129.86 = 2,289.96/x
  3. Step 3: Cross multiply
    2,989.80x = 4,129.86 × 2,289.96
  4. Step 4: Simplify right side
    2,989.80x = 9,457,214.21
  5. Step 5: Solve for x
    x = 9,457,214.21/2,989.80
  6. Step 6: Final answer
    x = 3,163.16

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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.