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Finding the Fourth Proportional to 20,874.70, 28,807.32 and 11,923.39

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Solution

The fourth proportional to 20,874.70, 28,807.32 and 11,923.39 is: 16,454.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.70 : 28,807.32 = 11,923.39 : x
  2. Step 2: Convert to fraction form
    20,874.70/28,807.32 = 11,923.39/x
  3. Step 3: Cross multiply
    20,874.70x = 28,807.32 × 11,923.39
  4. Step 4: Simplify right side
    20,874.70x = 343,480,911.21
  5. Step 5: Solve for x
    x = 343,480,911.21/20,874.70
  6. Step 6: Final answer
    x = 16,454.41

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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.