Home / 20,638.61-28,481.58-11,685.86

Finding the Fourth Proportional to 20,638.61, 28,481.58 and 11,685.86

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Solution

The fourth proportional to 20,638.61, 28,481.58 and 11,685.86 is: 16,126.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.61 : 28,481.58 = 11,685.86 : x
  2. Step 2: Convert to fraction form
    20,638.61/28,481.58 = 11,685.86/x
  3. Step 3: Cross multiply
    20,638.61x = 28,481.58 × 11,685.86
  4. Step 4: Simplify right side
    20,638.61x = 332,831,614.05
  5. Step 5: Solve for x
    x = 332,831,614.05/20,638.61
  6. Step 6: Final answer
    x = 16,126.65

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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.