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Finding the Fourth Proportional to 1,906.76, 2,860.68 and 1,213.40

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Solution

The fourth proportional to 1,906.76, 2,860.68 and 1,213.40 is: 1,820.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,906.76 : 2,860.68 = 1,213.40 : x
  2. Step 2: Convert to fraction form
    1,906.76/2,860.68 = 1,213.40/x
  3. Step 3: Cross multiply
    1,906.76x = 2,860.68 × 1,213.40
  4. Step 4: Simplify right side
    1,906.76x = 3,471,149.11
  5. Step 5: Solve for x
    x = 3,471,149.11/1,906.76
  6. Step 6: Final answer
    x = 1,820.44

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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.