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Finding the Fourth Proportional to 1,638.60, 2,451.90 and 1,206.60

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Solution

The fourth proportional to 1,638.60, 2,451.90 and 1,206.60 is: 1,805.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.60 : 2,451.90 = 1,206.60 : x
  2. Step 2: Convert to fraction form
    1,638.60/2,451.90 = 1,206.60/x
  3. Step 3: Cross multiply
    1,638.60x = 2,451.90 × 1,206.60
  4. Step 4: Simplify right side
    1,638.60x = 2,958,462.54
  5. Step 5: Solve for x
    x = 2,958,462.54/1,638.60
  6. Step 6: Final answer
    x = 1,805.48

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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.