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Finding the Fourth Proportional to 2,128.12, 3,192.30 and 829.48

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Solution

The fourth proportional to 2,128.12, 3,192.30 and 829.48 is: 1,244.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.12 : 3,192.30 = 829.48 : x
  2. Step 2: Convert to fraction form
    2,128.12/3,192.30 = 829.48/x
  3. Step 3: Cross multiply
    2,128.12x = 3,192.30 × 829.48
  4. Step 4: Simplify right side
    2,128.12x = 2,647,949.00
  5. Step 5: Solve for x
    x = 2,647,949.00/2,128.12
  6. Step 6: Final answer
    x = 1,244.27

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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.