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Finding the Fourth Proportional to 20,873.86, 28,807.92 and 11,922.70

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Solution

The fourth proportional to 20,873.86, 28,807.92 and 11,922.70 is: 16,454.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,873.86 : 28,807.92 = 11,922.70 : x
  2. Step 2: Convert to fraction form
    20,873.86/28,807.92 = 11,922.70/x
  3. Step 3: Cross multiply
    20,873.86x = 28,807.92 × 11,922.70
  4. Step 4: Simplify right side
    20,873.86x = 343,468,187.78
  5. Step 5: Solve for x
    x = 343,468,187.78/20,873.86
  6. Step 6: Final answer
    x = 16,454.46

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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.