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Finding the Fourth Proportional to 8,645.28, 12,960 and 4,200.36

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Solution

The fourth proportional to 8,645.28, 12,960 and 4,200.36 is: 6,296.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,645.28 : 12,960 = 4,200.36 : x
  2. Step 2: Convert to fraction form
    8,645.28/12,960 = 4,200.36/x
  3. Step 3: Cross multiply
    8,645.28x = 12,960 × 4,200.36
  4. Step 4: Simplify right side
    8,645.28x = 54,436,665.60
  5. Step 5: Solve for x
    x = 54,436,665.60/8,645.28
  6. Step 6: Final answer
    x = 6,296.69

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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.