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Finding the Fourth Proportional to 8,712.80, 13,040.40 and 8,021.60

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Solution

The fourth proportional to 8,712.80, 13,040.40 and 8,021.60 is: 12,005.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,712.80 : 13,040.40 = 8,021.60 : x
  2. Step 2: Convert to fraction form
    8,712.80/13,040.40 = 8,021.60/x
  3. Step 3: Cross multiply
    8,712.80x = 13,040.40 × 8,021.60
  4. Step 4: Simplify right side
    8,712.80x = 104,604,872.64
  5. Step 5: Solve for x
    x = 104,604,872.64/8,712.80
  6. Step 6: Final answer
    x = 12,005.88

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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.