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Finding the Fourth Proportional to 13,683.92, 18,881.44 and 7,939.30

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Solution

The fourth proportional to 13,683.92, 18,881.44 and 7,939.30 is: 10,954.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,683.92 : 18,881.44 = 7,939.30 : x
  2. Step 2: Convert to fraction form
    13,683.92/18,881.44 = 7,939.30/x
  3. Step 3: Cross multiply
    13,683.92x = 18,881.44 × 7,939.30
  4. Step 4: Simplify right side
    13,683.92x = 149,905,416.59
  5. Step 5: Solve for x
    x = 149,905,416.59/13,683.92
  6. Step 6: Final answer
    x = 10,954.86

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1.5x scale

Why These Related Problems?

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