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Finding the Fourth Proportional to 13,662.16, 20,516.02 and 12,639.28

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Solution

The fourth proportional to 13,662.16, 20,516.02 and 12,639.28 is: 18,979.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,662.16 : 20,516.02 = 12,639.28 : x
  2. Step 2: Convert to fraction form
    13,662.16/20,516.02 = 12,639.28/x
  3. Step 3: Cross multiply
    13,662.16x = 20,516.02 × 12,639.28
  4. Step 4: Simplify right side
    13,662.16x = 259,307,721.27
  5. Step 5: Solve for x
    x = 259,307,721.27/13,662.16
  6. Step 6: Final answer
    x = 18,979.99

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1.5x scale

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.