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Finding the Fourth Proportional to 2,640.12, 3,954.88 and 1,254.79

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Solution

The fourth proportional to 2,640.12, 3,954.88 and 1,254.79 is: 1,879.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,640.12 : 3,954.88 = 1,254.79 : x
  2. Step 2: Convert to fraction form
    2,640.12/3,954.88 = 1,254.79/x
  3. Step 3: Cross multiply
    2,640.12x = 3,954.88 × 1,254.79
  4. Step 4: Simplify right side
    2,640.12x = 4,962,551.27
  5. Step 5: Solve for x
    x = 4,962,551.27/2,640.12
  6. Step 6: Final answer
    x = 1,879.67

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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.