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Finding the Fourth Proportional to 13,469.79, 20,108.43 and 12,580.41

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Solution

The fourth proportional to 13,469.79, 20,108.43 and 12,580.41 is: 18,780.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,469.79 : 20,108.43 = 12,580.41 : x
  2. Step 2: Convert to fraction form
    13,469.79/20,108.43 = 12,580.41/x
  3. Step 3: Cross multiply
    13,469.79x = 20,108.43 × 12,580.41
  4. Step 4: Simplify right side
    13,469.79x = 252,972,293.86
  5. Step 5: Solve for x
    x = 252,972,293.86/13,469.79
  6. Step 6: Final answer
    x = 18,780.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.