Home / 2,821.23-3,889.62-2,157.03

Finding the Fourth Proportional to 2,821.23, 3,889.62 and 2,157.03

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Solution

The fourth proportional to 2,821.23, 3,889.62 and 2,157.03 is: 2,973.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,821.23 : 3,889.62 = 2,157.03 : x
  2. Step 2: Convert to fraction form
    2,821.23/3,889.62 = 2,157.03/x
  3. Step 3: Cross multiply
    2,821.23x = 3,889.62 × 2,157.03
  4. Step 4: Simplify right side
    2,821.23x = 8,390,027.03
  5. Step 5: Solve for x
    x = 8,390,027.03/2,821.23
  6. Step 6: Final answer
    x = 2,973.89

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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.