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Finding the Fourth Proportional to 16,918.20, 25,406.10 and 12,540.60

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Solution

The fourth proportional to 16,918.20, 25,406.10 and 12,540.60 is: 18,832.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,918.20 : 25,406.10 = 12,540.60 : x
  2. Step 2: Convert to fraction form
    16,918.20/25,406.10 = 12,540.60/x
  3. Step 3: Cross multiply
    16,918.20x = 25,406.10 × 12,540.60
  4. Step 4: Simplify right side
    16,918.20x = 318,607,737.66
  5. Step 5: Solve for x
    x = 318,607,737.66/16,918.20
  6. Step 6: Final answer
    x = 18,832.25

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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.