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Finding the Fourth Proportional to 12,636.12, 18,938.80 and 8,939.41

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Solution

The fourth proportional to 12,636.12, 18,938.80 and 8,939.41 is: 13,398.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,636.12 : 18,938.80 = 8,939.41 : x
  2. Step 2: Convert to fraction form
    12,636.12/18,938.80 = 8,939.41/x
  3. Step 3: Cross multiply
    12,636.12x = 18,938.80 × 8,939.41
  4. Step 4: Simplify right side
    12,636.12x = 169,301,698.11
  5. Step 5: Solve for x
    x = 169,301,698.11/12,636.12
  6. Step 6: Final answer
    x = 13,398.23

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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.