Home / 21,147.99-31,722.21-8,664.81

Finding the Fourth Proportional to 21,147.99, 31,722.21 and 8,664.81

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Solution

The fourth proportional to 21,147.99, 31,722.21 and 8,664.81 is: 12,997.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,147.99 : 31,722.21 = 8,664.81 : x
  2. Step 2: Convert to fraction form
    21,147.99/31,722.21 = 8,664.81/x
  3. Step 3: Cross multiply
    21,147.99x = 31,722.21 × 8,664.81
  4. Step 4: Simplify right side
    21,147.99x = 274,866,922.43
  5. Step 5: Solve for x
    x = 274,866,922.43/21,147.99
  6. Step 6: Final answer
    x = 12,997.31

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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.