Home / 2,172.30-3,258.45-1,078.80

Finding the Fourth Proportional to 2,172.30, 3,258.45 and 1,078.80

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Solution

The fourth proportional to 2,172.30, 3,258.45 and 1,078.80 is: 1,618.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.30 : 3,258.45 = 1,078.80 : x
  2. Step 2: Convert to fraction form
    2,172.30/3,258.45 = 1,078.80/x
  3. Step 3: Cross multiply
    2,172.30x = 3,258.45 × 1,078.80
  4. Step 4: Simplify right side
    2,172.30x = 3,515,215.86
  5. Step 5: Solve for x
    x = 3,515,215.86/2,172.30
  6. Step 6: Final answer
    x = 1,618.20

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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.