Home / 2,121.16-3,181.48-660.28

Finding the Fourth Proportional to 2,121.16, 3,181.48 and 660.28

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Solution

The fourth proportional to 2,121.16, 3,181.48 and 660.28 is: 990.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.16 : 3,181.48 = 660.28 : x
  2. Step 2: Convert to fraction form
    2,121.16/3,181.48 = 660.28/x
  3. Step 3: Cross multiply
    2,121.16x = 3,181.48 × 660.28
  4. Step 4: Simplify right side
    2,121.16x = 2,100,667.61
  5. Step 5: Solve for x
    x = 2,100,667.61/2,121.16
  6. Step 6: Final answer
    x = 990.34

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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.