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Finding the Fourth Proportional to 20,893.90, 28,831.47 and 11,820.25

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Solution

The fourth proportional to 20,893.90, 28,831.47 and 11,820.25 is: 16,310.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,893.90 : 28,831.47 = 11,820.25 : x
  2. Step 2: Convert to fraction form
    20,893.90/28,831.47 = 11,820.25/x
  3. Step 3: Cross multiply
    20,893.90x = 28,831.47 × 11,820.25
  4. Step 4: Simplify right side
    20,893.90x = 340,795,183.27
  5. Step 5: Solve for x
    x = 340,795,183.27/20,893.90
  6. Step 6: Final answer
    x = 16,310.75

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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.