Home / 20,861.64-28,781.73-11,902.68

Finding the Fourth Proportional to 20,861.64, 28,781.73 and 11,902.68

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Solution

The fourth proportional to 20,861.64, 28,781.73 and 11,902.68 is: 16,421.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.64 : 28,781.73 = 11,902.68 : x
  2. Step 2: Convert to fraction form
    20,861.64/28,781.73 = 11,902.68/x
  3. Step 3: Cross multiply
    20,861.64x = 28,781.73 × 11,902.68
  4. Step 4: Simplify right side
    20,861.64x = 342,579,722.04
  5. Step 5: Solve for x
    x = 342,579,722.04/20,861.64
  6. Step 6: Final answer
    x = 16,421.51

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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.