Home / 12,664.50-18,987.97-5,640.79

Finding the Fourth Proportional to 12,664.50, 18,987.97 and 5,640.79

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Solution

The fourth proportional to 12,664.50, 18,987.97 and 5,640.79 is: 8,457.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,664.50 : 18,987.97 = 5,640.79 : x
  2. Step 2: Convert to fraction form
    12,664.50/18,987.97 = 5,640.79/x
  3. Step 3: Cross multiply
    12,664.50x = 18,987.97 × 5,640.79
  4. Step 4: Simplify right side
    12,664.50x = 107,107,135.90
  5. Step 5: Solve for x
    x = 107,107,135.90/12,664.50
  6. Step 6: Final answer
    x = 8,457.27

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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.