Home / 2,111.20-3,168.30-812.66

Finding the Fourth Proportional to 2,111.20, 3,168.30 and 812.66

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Solution

The fourth proportional to 2,111.20, 3,168.30 and 812.66 is: 1,219.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,111.20 : 3,168.30 = 812.66 : x
  2. Step 2: Convert to fraction form
    2,111.20/3,168.30 = 812.66/x
  3. Step 3: Cross multiply
    2,111.20x = 3,168.30 × 812.66
  4. Step 4: Simplify right side
    2,111.20x = 2,574,750.68
  5. Step 5: Solve for x
    x = 2,574,750.68/2,111.20
  6. Step 6: Final answer
    x = 1,219.57

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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.