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Finding the Fourth Proportional to 2,559.78, 3,840.08 and 828

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Solution

The fourth proportional to 2,559.78, 3,840.08 and 828 is: 1,242.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,559.78 : 3,840.08 = 828 : x
  2. Step 2: Convert to fraction form
    2,559.78/3,840.08 = 828/x
  3. Step 3: Cross multiply
    2,559.78x = 3,840.08 × 828
  4. Step 4: Simplify right side
    2,559.78x = 3,179,582.10
  5. Step 5: Solve for x
    x = 3,179,582.10/2,559.78
  6. Step 6: Final answer
    x = 1,242.13

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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.