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Finding the Fourth Proportional to 18,696.64, 28,004.72 and 8,821.12

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Solution

The fourth proportional to 18,696.64, 28,004.72 and 8,821.12 is: 13,212.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,696.64 : 28,004.72 = 8,821.12 : x
  2. Step 2: Convert to fraction form
    18,696.64/28,004.72 = 8,821.12/x
  3. Step 3: Cross multiply
    18,696.64x = 28,004.72 × 8,821.12
  4. Step 4: Simplify right side
    18,696.64x = 247,032,995.69
  5. Step 5: Solve for x
    x = 247,032,995.69/18,696.64
  6. Step 6: Final answer
    x = 13,212.69

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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.