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Finding the Fourth Proportional to 3,910.66, 5,866.47 and 1,278.43

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Solution

The fourth proportional to 3,910.66, 5,866.47 and 1,278.43 is: 1,917.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,910.66 : 5,866.47 = 1,278.43 : x
  2. Step 2: Convert to fraction form
    3,910.66/5,866.47 = 1,278.43/x
  3. Step 3: Cross multiply
    3,910.66x = 5,866.47 × 1,278.43
  4. Step 4: Simplify right side
    3,910.66x = 7,499,835.52
  5. Step 5: Solve for x
    x = 7,499,835.52/3,910.66
  6. Step 6: Final answer
    x = 1,917.80

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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.