Home / 2,143.20-3,214.80-1,221.60

Finding the Fourth Proportional to 2,143.20, 3,214.80 and 1,221.60

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Solution

The fourth proportional to 2,143.20, 3,214.80 and 1,221.60 is: 1,832.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,143.20 : 3,214.80 = 1,221.60 : x
  2. Step 2: Convert to fraction form
    2,143.20/3,214.80 = 1,221.60/x
  3. Step 3: Cross multiply
    2,143.20x = 3,214.80 × 1,221.60
  4. Step 4: Simplify right side
    2,143.20x = 3,927,199.68
  5. Step 5: Solve for x
    x = 3,927,199.68/2,143.20
  6. Step 6: Final answer
    x = 1,832.40

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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.