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Finding the Fourth Proportional to 13,728.36, 18,938.16 and 8,684.08

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Solution

The fourth proportional to 13,728.36, 18,938.16 and 8,684.08 is: 11,979.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,728.36 : 18,938.16 = 8,684.08 : x
  2. Step 2: Convert to fraction form
    13,728.36/18,938.16 = 8,684.08/x
  3. Step 3: Cross multiply
    13,728.36x = 18,938.16 × 8,684.08
  4. Step 4: Simplify right side
    13,728.36x = 164,460,496.49
  5. Step 5: Solve for x
    x = 164,460,496.49/13,728.36
  6. Step 6: Final answer
    x = 11,979.62

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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.