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Finding the Fourth Proportional to 19,638.40, 27,109.76 and 11,683.40

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Solution

The fourth proportional to 19,638.40, 27,109.76 and 11,683.40 is: 16,128.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,638.40 : 27,109.76 = 11,683.40 : x
  2. Step 2: Convert to fraction form
    19,638.40/27,109.76 = 11,683.40/x
  3. Step 3: Cross multiply
    19,638.40x = 27,109.76 × 11,683.40
  4. Step 4: Simplify right side
    19,638.40x = 316,734,169.98
  5. Step 5: Solve for x
    x = 316,734,169.98/19,638.40
  6. Step 6: Final answer
    x = 16,128.31

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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.