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Finding the Fourth Proportional to 3,938.75, 5,429.75 and 2,817.75

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Solution

The fourth proportional to 3,938.75, 5,429.75 and 2,817.75 is: 3,884.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,938.75 : 5,429.75 = 2,817.75 : x
  2. Step 2: Convert to fraction form
    3,938.75/5,429.75 = 2,817.75/x
  3. Step 3: Cross multiply
    3,938.75x = 5,429.75 × 2,817.75
  4. Step 4: Simplify right side
    3,938.75x = 15,299,636.83
  5. Step 5: Solve for x
    x = 15,299,636.83/3,938.75
  6. Step 6: Final answer
    x = 3,884.39

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1.5x scale

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.