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Finding the Fourth Proportional to 3,874.86, 5,812.29 and 1,278

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Solution

The fourth proportional to 3,874.86, 5,812.29 and 1,278 is: 1,917

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,874.86 : 5,812.29 = 1,278 : x
  2. Step 2: Convert to fraction form
    3,874.86/5,812.29 = 1,278/x
  3. Step 3: Cross multiply
    3,874.86x = 5,812.29 × 1,278
  4. Step 4: Simplify right side
    3,874.86x = 7,428,106.62
  5. Step 5: Solve for x
    x = 7,428,106.62/3,874.86
  6. Step 6: Final answer
    x = 1,917

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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.