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Finding the Fourth Proportional to 2,745.27, 4,116.87 and 989.79

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Solution

The fourth proportional to 2,745.27, 4,116.87 and 989.79 is: 1,484.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,745.27 : 4,116.87 = 989.79 : x
  2. Step 2: Convert to fraction form
    2,745.27/4,116.87 = 989.79/x
  3. Step 3: Cross multiply
    2,745.27x = 4,116.87 × 989.79
  4. Step 4: Simplify right side
    2,745.27x = 4,074,836.76
  5. Step 5: Solve for x
    x = 4,074,836.76/2,745.27
  6. Step 6: Final answer
    x = 1,484.31

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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.