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Finding the Fourth Proportional to 76,808.80, 115,213.20 and 21,404.80

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Solution

The fourth proportional to 76,808.80, 115,213.20 and 21,404.80 is: 32,107.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,808.80 : 115,213.20 = 21,404.80 : x
  2. Step 2: Convert to fraction form
    76,808.80/115,213.20 = 21,404.80/x
  3. Step 3: Cross multiply
    76,808.80x = 115,213.20 × 21,404.80
  4. Step 4: Simplify right side
    76,808.80x = 2,466,115,503.36
  5. Step 5: Solve for x
    x = 2,466,115,503.36/76,808.80
  6. Step 6: Final answer
    x = 32,107.20

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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.