Home / 20,921.68-28,871.60-11,971.38

Finding the Fourth Proportional to 20,921.68, 28,871.60 and 11,971.38

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Solution

The fourth proportional to 20,921.68, 28,871.60 and 11,971.38 is: 16,520.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.68 : 28,871.60 = 11,971.38 : x
  2. Step 2: Convert to fraction form
    20,921.68/28,871.60 = 11,971.38/x
  3. Step 3: Cross multiply
    20,921.68x = 28,871.60 × 11,971.38
  4. Step 4: Simplify right side
    20,921.68x = 345,632,894.81
  5. Step 5: Solve for x
    x = 345,632,894.81/20,921.68
  6. Step 6: Final answer
    x = 16,520.32

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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.