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Finding the Fourth Proportional to 8,978.61, 13,469.60 and 2,739.18

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Solution

The fourth proportional to 8,978.61, 13,469.60 and 2,739.18 is: 4,109.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,978.61 : 13,469.60 = 2,739.18 : x
  2. Step 2: Convert to fraction form
    8,978.61/13,469.60 = 2,739.18/x
  3. Step 3: Cross multiply
    8,978.61x = 13,469.60 × 2,739.18
  4. Step 4: Simplify right side
    8,978.61x = 36,895,658.93
  5. Step 5: Solve for x
    x = 36,895,658.93/8,978.61
  6. Step 6: Final answer
    x = 4,109.28

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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.