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Finding the Fourth Proportional to 28,909.92, 43,361.28 and 9,188.64

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Solution

The fourth proportional to 28,909.92, 43,361.28 and 9,188.64 is: 13,781.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,909.92 : 43,361.28 = 9,188.64 : x
  2. Step 2: Convert to fraction form
    28,909.92/43,361.28 = 9,188.64/x
  3. Step 3: Cross multiply
    28,909.92x = 43,361.28 × 9,188.64
  4. Step 4: Simplify right side
    28,909.92x = 398,431,191.86
  5. Step 5: Solve for x
    x = 398,431,191.86/28,909.92
  6. Step 6: Final answer
    x = 13,781.82

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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.