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Finding the Fourth Proportional to 18,947.63, 28,421.43 and 10,519.30

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Solution

The fourth proportional to 18,947.63, 28,421.43 and 10,519.30 is: 15,778.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,947.63 : 28,421.43 = 10,519.30 : x
  2. Step 2: Convert to fraction form
    18,947.63/28,421.43 = 10,519.30/x
  3. Step 3: Cross multiply
    18,947.63x = 28,421.43 × 10,519.30
  4. Step 4: Simplify right side
    18,947.63x = 298,973,548.60
  5. Step 5: Solve for x
    x = 298,973,548.60/18,947.63
  6. Step 6: Final answer
    x = 15,778.94

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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.