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Finding the Fourth Proportional to 20,883, 28,820.51 and 11,930.55

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Solution

The fourth proportional to 20,883, 28,820.51 and 11,930.55 is: 16,465.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,883 : 28,820.51 = 11,930.55 : x
  2. Step 2: Convert to fraction form
    20,883/28,820.51 = 11,930.55/x
  3. Step 3: Cross multiply
    20,883x = 28,820.51 × 11,930.55
  4. Step 4: Simplify right side
    20,883x = 343,844,535.58
  5. Step 5: Solve for x
    x = 343,844,535.58/20,883
  6. Step 6: Final answer
    x = 16,465.28

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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.