Home / 2,189.47-3,285.78-1,078.64

Finding the Fourth Proportional to 2,189.47, 3,285.78 and 1,078.64

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Solution

The fourth proportional to 2,189.47, 3,285.78 and 1,078.64 is: 1,618.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.47 : 3,285.78 = 1,078.64 : x
  2. Step 2: Convert to fraction form
    2,189.47/3,285.78 = 1,078.64/x
  3. Step 3: Cross multiply
    2,189.47x = 3,285.78 × 1,078.64
  4. Step 4: Simplify right side
    2,189.47x = 3,544,173.74
  5. Step 5: Solve for x
    x = 3,544,173.74/2,189.47
  6. Step 6: Final answer
    x = 1,618.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.