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Finding the Fourth Proportional to 28,361.12, 42,540.12 and 8,638.02

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Solution

The fourth proportional to 28,361.12, 42,540.12 and 8,638.02 is: 12,956.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,361.12 : 42,540.12 = 8,638.02 : x
  2. Step 2: Convert to fraction form
    28,361.12/42,540.12 = 8,638.02/x
  3. Step 3: Cross multiply
    28,361.12x = 42,540.12 × 8,638.02
  4. Step 4: Simplify right side
    28,361.12x = 367,462,407.36
  5. Step 5: Solve for x
    x = 367,462,407.36/28,361.12
  6. Step 6: Final answer
    x = 12,956.56

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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.