Home / 2,128.15-3,192.23-828.78

Finding the Fourth Proportional to 2,128.15, 3,192.23 and 828.78

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Solution

The fourth proportional to 2,128.15, 3,192.23 and 828.78 is: 1,243.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.15 : 3,192.23 = 828.78 : x
  2. Step 2: Convert to fraction form
    2,128.15/3,192.23 = 828.78/x
  3. Step 3: Cross multiply
    2,128.15x = 3,192.23 × 828.78
  4. Step 4: Simplify right side
    2,128.15x = 2,645,636.27
  5. Step 5: Solve for x
    x = 2,645,636.27/2,128.15
  6. Step 6: Final answer
    x = 1,243.16

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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.