Home / 2,120.12-3,181.58-871.73

Finding the Fourth Proportional to 2,120.12, 3,181.58 and 871.73

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Solution

The fourth proportional to 2,120.12, 3,181.58 and 871.73 is: 1,308.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.12 : 3,181.58 = 871.73 : x
  2. Step 2: Convert to fraction form
    2,120.12/3,181.58 = 871.73/x
  3. Step 3: Cross multiply
    2,120.12x = 3,181.58 × 871.73
  4. Step 4: Simplify right side
    2,120.12x = 2,773,478.73
  5. Step 5: Solve for x
    x = 2,773,478.73/2,120.12
  6. Step 6: Final answer
    x = 1,308.17

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1.5x scale

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.