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Finding the Fourth Proportional to 3,321.40, 4,978.62 and 1,240.56

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Solution

The fourth proportional to 3,321.40, 4,978.62 and 1,240.56 is: 1,859.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,321.40 : 4,978.62 = 1,240.56 : x
  2. Step 2: Convert to fraction form
    3,321.40/4,978.62 = 1,240.56/x
  3. Step 3: Cross multiply
    3,321.40x = 4,978.62 × 1,240.56
  4. Step 4: Simplify right side
    3,321.40x = 6,176,276.83
  5. Step 5: Solve for x
    x = 6,176,276.83/3,321.40
  6. Step 6: Final answer
    x = 1,859.54

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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.