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Finding the Fourth Proportional to 2,672.76, 4,010 and 1,286.20

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Solution

The fourth proportional to 2,672.76, 4,010 and 1,286.20 is: 1,929.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,672.76 : 4,010 = 1,286.20 : x
  2. Step 2: Convert to fraction form
    2,672.76/4,010 = 1,286.20/x
  3. Step 3: Cross multiply
    2,672.76x = 4,010 × 1,286.20
  4. Step 4: Simplify right side
    2,672.76x = 5,157,662
  5. Step 5: Solve for x
    x = 5,157,662/2,672.76
  6. Step 6: Final answer
    x = 1,929.71

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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.