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Finding the Fourth Proportional to 2,181.90, 3,008.74 and 1,868.21

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Solution

The fourth proportional to 2,181.90, 3,008.74 and 1,868.21 is: 2,576.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,181.90 : 3,008.74 = 1,868.21 : x
  2. Step 2: Convert to fraction form
    2,181.90/3,008.74 = 1,868.21/x
  3. Step 3: Cross multiply
    2,181.90x = 3,008.74 × 1,868.21
  4. Step 4: Simplify right side
    2,181.90x = 5,620,958.16
  5. Step 5: Solve for x
    x = 5,620,958.16/2,181.90
  6. Step 6: Final answer
    x = 2,576.18

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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.