Home / 2,111.10-3,166.64-811.65

Finding the Fourth Proportional to 2,111.10, 3,166.64 and 811.65

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Solution

The fourth proportional to 2,111.10, 3,166.64 and 811.65 is: 1,217.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,111.10 : 3,166.64 = 811.65 : x
  2. Step 2: Convert to fraction form
    2,111.10/3,166.64 = 811.65/x
  3. Step 3: Cross multiply
    2,111.10x = 3,166.64 × 811.65
  4. Step 4: Simplify right side
    2,111.10x = 2,570,218.78
  5. Step 5: Solve for x
    x = 2,570,218.78/2,111.10
  6. Step 6: Final answer
    x = 1,217.48

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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.