Home / 21,100.65-31,639.29-8,629.43

Finding the Fourth Proportional to 21,100.65, 31,639.29 and 8,629.43

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Solution

The fourth proportional to 21,100.65, 31,639.29 and 8,629.43 is: 12,939.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,100.65 : 31,639.29 = 8,629.43 : x
  2. Step 2: Convert to fraction form
    21,100.65/31,639.29 = 8,629.43/x
  3. Step 3: Cross multiply
    21,100.65x = 31,639.29 × 8,629.43
  4. Step 4: Simplify right side
    21,100.65x = 273,029,032.39
  5. Step 5: Solve for x
    x = 273,029,032.39/21,100.65
  6. Step 6: Final answer
    x = 12,939.37

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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.