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Finding the Fourth Proportional to 18,939.28, 28,389.78 and 7,830.64

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Solution

The fourth proportional to 18,939.28, 28,389.78 and 7,830.64 is: 11,738.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.28 : 28,389.78 = 7,830.64 : x
  2. Step 2: Convert to fraction form
    18,939.28/28,389.78 = 7,830.64/x
  3. Step 3: Cross multiply
    18,939.28x = 28,389.78 × 7,830.64
  4. Step 4: Simplify right side
    18,939.28x = 222,310,146.86
  5. Step 5: Solve for x
    x = 222,310,146.86/18,939.28
  6. Step 6: Final answer
    x = 11,738.05

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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.