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Finding the Fourth Proportional to 1,966.50, 2,713.90 and 1,138.50

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Solution

The fourth proportional to 1,966.50, 2,713.90 and 1,138.50 is: 1,571.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,966.50 : 2,713.90 = 1,138.50 : x
  2. Step 2: Convert to fraction form
    1,966.50/2,713.90 = 1,138.50/x
  3. Step 3: Cross multiply
    1,966.50x = 2,713.90 × 1,138.50
  4. Step 4: Simplify right side
    1,966.50x = 3,089,775.15
  5. Step 5: Solve for x
    x = 3,089,775.15/1,966.50
  6. Step 6: Final answer
    x = 1,571.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.