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Finding the Fourth Proportional to 8,604.72, 12,897.36 and 3,978

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Solution

The fourth proportional to 8,604.72, 12,897.36 and 3,978 is: 5,962.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,604.72 : 12,897.36 = 3,978 : x
  2. Step 2: Convert to fraction form
    8,604.72/12,897.36 = 3,978/x
  3. Step 3: Cross multiply
    8,604.72x = 12,897.36 × 3,978
  4. Step 4: Simplify right side
    8,604.72x = 51,305,698.08
  5. Step 5: Solve for x
    x = 51,305,698.08/8,604.72
  6. Step 6: Final answer
    x = 5,962.51

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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.