Home / 8,721.36-13,087.80-5,208.78

Finding the Fourth Proportional to 8,721.36, 13,087.80 and 5,208.78

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Solution

The fourth proportional to 8,721.36, 13,087.80 and 5,208.78 is: 7,816.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,721.36 : 13,087.80 = 5,208.78 : x
  2. Step 2: Convert to fraction form
    8,721.36/13,087.80 = 5,208.78/x
  3. Step 3: Cross multiply
    8,721.36x = 13,087.80 × 5,208.78
  4. Step 4: Simplify right side
    8,721.36x = 68,171,470.88
  5. Step 5: Solve for x
    x = 68,171,470.88/8,721.36
  6. Step 6: Final answer
    x = 7,816.61

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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.