Home / 21,272.13-31,912.83-8,128.26

Finding the Fourth Proportional to 21,272.13, 31,912.83 and 8,128.26

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Solution

The fourth proportional to 21,272.13, 31,912.83 and 8,128.26 is: 12,194.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,272.13 : 31,912.83 = 8,128.26 : x
  2. Step 2: Convert to fraction form
    21,272.13/31,912.83 = 8,128.26/x
  3. Step 3: Cross multiply
    21,272.13x = 31,912.83 × 8,128.26
  4. Step 4: Simplify right side
    21,272.13x = 259,395,779.58
  5. Step 5: Solve for x
    x = 259,395,779.58/21,272.13
  6. Step 6: Final answer
    x = 12,194.16

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1.5x scale

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.