Home / 2,989.20-4,122-2,103.60

Finding the Fourth Proportional to 2,989.20, 4,122 and 2,103.60

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Solution

The fourth proportional to 2,989.20, 4,122 and 2,103.60 is: 2,900.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,989.20 : 4,122 = 2,103.60 : x
  2. Step 2: Convert to fraction form
    2,989.20/4,122 = 2,103.60/x
  3. Step 3: Cross multiply
    2,989.20x = 4,122 × 2,103.60
  4. Step 4: Simplify right side
    2,989.20x = 8,671,039.20
  5. Step 5: Solve for x
    x = 8,671,039.20/2,989.20
  6. Step 6: Final answer
    x = 2,900.79

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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.