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Finding the Fourth Proportional to 18,786.88, 28,178.16 and 7,101.28

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Solution

The fourth proportional to 18,786.88, 28,178.16 and 7,101.28 is: 10,651.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,786.88 : 28,178.16 = 7,101.28 : x
  2. Step 2: Convert to fraction form
    18,786.88/28,178.16 = 7,101.28/x
  3. Step 3: Cross multiply
    18,786.88x = 28,178.16 × 7,101.28
  4. Step 4: Simplify right side
    18,786.88x = 200,101,004.04
  5. Step 5: Solve for x
    x = 200,101,004.04/18,786.88
  6. Step 6: Final answer
    x = 10,651.10

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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.