Home / 2,172.20-2,997.64-1,288.44

Finding the Fourth Proportional to 2,172.20, 2,997.64 and 1,288.44

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Solution

The fourth proportional to 2,172.20, 2,997.64 and 1,288.44 is: 1,778.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.20 : 2,997.64 = 1,288.44 : x
  2. Step 2: Convert to fraction form
    2,172.20/2,997.64 = 1,288.44/x
  3. Step 3: Cross multiply
    2,172.20x = 2,997.64 × 1,288.44
  4. Step 4: Simplify right side
    2,172.20x = 3,862,279.28
  5. Step 5: Solve for x
    x = 3,862,279.28/2,172.20
  6. Step 6: Final answer
    x = 1,778.05

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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.