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Finding the Fourth Proportional to 7,871.41, 11,801.79 and 3,917.65

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Solution

The fourth proportional to 7,871.41, 11,801.79 and 3,917.65 is: 5,873.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,871.41 : 11,801.79 = 3,917.65 : x
  2. Step 2: Convert to fraction form
    7,871.41/11,801.79 = 3,917.65/x
  3. Step 3: Cross multiply
    7,871.41x = 11,801.79 × 3,917.65
  4. Step 4: Simplify right side
    7,871.41x = 46,235,282.59
  5. Step 5: Solve for x
    x = 46,235,282.59/7,871.41
  6. Step 6: Final answer
    x = 5,873.82

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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.