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Finding the Fourth Proportional to 18,783.68, 28,189.71 and 12,846.38

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Solution

The fourth proportional to 18,783.68, 28,189.71 and 12,846.38 is: 19,279.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,783.68 : 28,189.71 = 12,846.38 : x
  2. Step 2: Convert to fraction form
    18,783.68/28,189.71 = 12,846.38/x
  3. Step 3: Cross multiply
    18,783.68x = 28,189.71 × 12,846.38
  4. Step 4: Simplify right side
    18,783.68x = 362,135,585.80
  5. Step 5: Solve for x
    x = 362,135,585.80/18,783.68
  6. Step 6: Final answer
    x = 19,279.27

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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.