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Finding the Fourth Proportional to 2,560.42, 3,840.54 and 829

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Solution

The fourth proportional to 2,560.42, 3,840.54 and 829 is: 1,243.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,560.42 : 3,840.54 = 829 : x
  2. Step 2: Convert to fraction form
    2,560.42/3,840.54 = 829/x
  3. Step 3: Cross multiply
    2,560.42x = 3,840.54 × 829
  4. Step 4: Simplify right side
    2,560.42x = 3,183,807.66
  5. Step 5: Solve for x
    x = 3,183,807.66/2,560.42
  6. Step 6: Final answer
    x = 1,243.47

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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.