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Finding the Fourth Proportional to 18,960.72, 28,447.66 and 8,431.68

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Solution

The fourth proportional to 18,960.72, 28,447.66 and 8,431.68 is: 12,650.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,960.72 : 28,447.66 = 8,431.68 : x
  2. Step 2: Convert to fraction form
    18,960.72/28,447.66 = 8,431.68/x
  3. Step 3: Cross multiply
    18,960.72x = 28,447.66 × 8,431.68
  4. Step 4: Simplify right side
    18,960.72x = 239,861,565.87
  5. Step 5: Solve for x
    x = 239,861,565.87/18,960.72
  6. Step 6: Final answer
    x = 12,650.45

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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.