Home / 2,172.12-2,997.72-1,240.68

Finding the Fourth Proportional to 2,172.12, 2,997.72 and 1,240.68

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Solution

The fourth proportional to 2,172.12, 2,997.72 and 1,240.68 is: 1,712.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.12 : 2,997.72 = 1,240.68 : x
  2. Step 2: Convert to fraction form
    2,172.12/2,997.72 = 1,240.68/x
  3. Step 3: Cross multiply
    2,172.12x = 2,997.72 × 1,240.68
  4. Step 4: Simplify right side
    2,172.12x = 3,719,211.25
  5. Step 5: Solve for x
    x = 3,719,211.25/2,172.12
  6. Step 6: Final answer
    x = 1,712.25

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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.