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Finding the Fourth Proportional to 3,978.54, 5,970.21 and 3,159.66

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Solution

The fourth proportional to 3,978.54, 5,970.21 and 3,159.66 is: 4,741.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.54 : 5,970.21 = 3,159.66 : x
  2. Step 2: Convert to fraction form
    3,978.54/5,970.21 = 3,159.66/x
  3. Step 3: Cross multiply
    3,978.54x = 5,970.21 × 3,159.66
  4. Step 4: Simplify right side
    3,978.54x = 18,863,833.73
  5. Step 5: Solve for x
    x = 18,863,833.73/3,978.54
  6. Step 6: Final answer
    x = 4,741.40

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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.