Home / 20,735.72-28,615.74-12,239.90

Finding the Fourth Proportional to 20,735.72, 28,615.74 and 12,239.90

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Solution

The fourth proportional to 20,735.72, 28,615.74 and 12,239.90 is: 16,891.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,735.72 : 28,615.74 = 12,239.90 : x
  2. Step 2: Convert to fraction form
    20,735.72/28,615.74 = 12,239.90/x
  3. Step 3: Cross multiply
    20,735.72x = 28,615.74 × 12,239.90
  4. Step 4: Simplify right side
    20,735.72x = 350,253,796.03
  5. Step 5: Solve for x
    x = 350,253,796.03/20,735.72
  6. Step 6: Final answer
    x = 16,891.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.