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Finding the Fourth Proportional to 18,980.10, 28,469.54 and 8,591.86

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Solution

The fourth proportional to 18,980.10, 28,469.54 and 8,591.86 is: 12,887.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,980.10 : 28,469.54 = 8,591.86 : x
  2. Step 2: Convert to fraction form
    18,980.10/28,469.54 = 8,591.86/x
  3. Step 3: Cross multiply
    18,980.10x = 28,469.54 × 8,591.86
  4. Step 4: Simplify right side
    18,980.10x = 244,606,301.94
  5. Step 5: Solve for x
    x = 244,606,301.94/18,980.10
  6. Step 6: Final answer
    x = 12,887.51

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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.