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Finding the Fourth Proportional to 18,783.08, 28,129.90 and 10,868.92

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Solution

The fourth proportional to 18,783.08, 28,129.90 and 10,868.92 is: 16,277.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,783.08 : 28,129.90 = 10,868.92 : x
  2. Step 2: Convert to fraction form
    18,783.08/28,129.90 = 10,868.92/x
  3. Step 3: Cross multiply
    18,783.08x = 28,129.90 × 10,868.92
  4. Step 4: Simplify right side
    18,783.08x = 305,741,669.88
  5. Step 5: Solve for x
    x = 305,741,669.88/18,783.08
  6. Step 6: Final answer
    x = 16,277.50

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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.