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Finding the Fourth Proportional to 13,668.90, 18,874.26 and 8,641.23

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Solution

The fourth proportional to 13,668.90, 18,874.26 and 8,641.23 is: 11,931.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,668.90 : 18,874.26 = 8,641.23 : x
  2. Step 2: Convert to fraction form
    13,668.90/18,874.26 = 8,641.23/x
  3. Step 3: Cross multiply
    13,668.90x = 18,874.26 × 8,641.23
  4. Step 4: Simplify right side
    13,668.90x = 163,096,821.74
  5. Step 5: Solve for x
    x = 163,096,821.74/13,668.90
  6. Step 6: Final answer
    x = 11,931.96

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.