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Finding the Fourth Proportional to 3,909, 5,394.40 and 2,140.60

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Solution

The fourth proportional to 3,909, 5,394.40 and 2,140.60 is: 2,954.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909 : 5,394.40 = 2,140.60 : x
  2. Step 2: Convert to fraction form
    3,909/5,394.40 = 2,140.60/x
  3. Step 3: Cross multiply
    3,909x = 5,394.40 × 2,140.60
  4. Step 4: Simplify right side
    3,909x = 11,547,252.64
  5. Step 5: Solve for x
    x = 11,547,252.64/3,909
  6. Step 6: Final answer
    x = 2,954.02

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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.