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Finding the Fourth Proportional to 18,906.90, 28,361.73 and 6,421.86

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Solution

The fourth proportional to 18,906.90, 28,361.73 and 6,421.86 is: 9,633.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,906.90 : 28,361.73 = 6,421.86 : x
  2. Step 2: Convert to fraction form
    18,906.90/28,361.73 = 6,421.86/x
  3. Step 3: Cross multiply
    18,906.90x = 28,361.73 × 6,421.86
  4. Step 4: Simplify right side
    18,906.90x = 182,135,059.42
  5. Step 5: Solve for x
    x = 182,135,059.42/18,906.90
  6. Step 6: Final answer
    x = 9,633.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.