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Finding the Fourth Proportional to 2,559.40, 3,839.10 and 828.20

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Solution

The fourth proportional to 2,559.40, 3,839.10 and 828.20 is: 1,242.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,559.40 : 3,839.10 = 828.20 : x
  2. Step 2: Convert to fraction form
    2,559.40/3,839.10 = 828.20/x
  3. Step 3: Cross multiply
    2,559.40x = 3,839.10 × 828.20
  4. Step 4: Simplify right side
    2,559.40x = 3,179,542.62
  5. Step 5: Solve for x
    x = 3,179,542.62/2,559.40
  6. Step 6: Final answer
    x = 1,242.30

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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.