Home / 20,403.90-28,157.40-11,911.86

Finding the Fourth Proportional to 20,403.90, 28,157.40 and 11,911.86

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Solution

The fourth proportional to 20,403.90, 28,157.40 and 11,911.86 is: 16,438.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,403.90 : 28,157.40 = 11,911.86 : x
  2. Step 2: Convert to fraction form
    20,403.90/28,157.40 = 11,911.86/x
  3. Step 3: Cross multiply
    20,403.90x = 28,157.40 × 11,911.86
  4. Step 4: Simplify right side
    20,403.90x = 335,407,006.76
  5. Step 5: Solve for x
    x = 335,407,006.76/20,403.90
  6. Step 6: Final answer
    x = 16,438.38

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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.