Home / 2,121.12-3,181.66-871.48

Finding the Fourth Proportional to 2,121.12, 3,181.66 and 871.48

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Solution

The fourth proportional to 2,121.12, 3,181.66 and 871.48 is: 1,307.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.12 : 3,181.66 = 871.48 : x
  2. Step 2: Convert to fraction form
    2,121.12/3,181.66 = 871.48/x
  3. Step 3: Cross multiply
    2,121.12x = 3,181.66 × 871.48
  4. Step 4: Simplify right side
    2,121.12x = 2,772,753.06
  5. Step 5: Solve for x
    x = 2,772,753.06/2,121.12
  6. Step 6: Final answer
    x = 1,307.21

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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.