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Finding the Fourth Proportional to 12,659.28, 18,998.20 and 4,769.20

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Solution

The fourth proportional to 12,659.28, 18,998.20 and 4,769.20 is: 7,157.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,659.28 : 18,998.20 = 4,769.20 : x
  2. Step 2: Convert to fraction form
    12,659.28/18,998.20 = 4,769.20/x
  3. Step 3: Cross multiply
    12,659.28x = 18,998.20 × 4,769.20
  4. Step 4: Simplify right side
    12,659.28x = 90,606,215.44
  5. Step 5: Solve for x
    x = 90,606,215.44/12,659.28
  6. Step 6: Final answer
    x = 7,157.30

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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.