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Finding the Fourth Proportional to 80,469.36, 120,690.12 and 21,305.88

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Solution

The fourth proportional to 80,469.36, 120,690.12 and 21,305.88 is: 31,955.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,469.36 : 120,690.12 = 21,305.88 : x
  2. Step 2: Convert to fraction form
    80,469.36/120,690.12 = 21,305.88/x
  3. Step 3: Cross multiply
    80,469.36x = 120,690.12 × 21,305.88
  4. Step 4: Simplify right side
    80,469.36x = 2,571,409,213.91
  5. Step 5: Solve for x
    x = 2,571,409,213.91/80,469.36
  6. Step 6: Final answer
    x = 31,955.13

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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.