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Finding the Fourth Proportional to 8,905.22, 13,360.90 and 3,978.26

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Solution

The fourth proportional to 8,905.22, 13,360.90 and 3,978.26 is: 5,968.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,905.22 : 13,360.90 = 3,978.26 : x
  2. Step 2: Convert to fraction form
    8,905.22/13,360.90 = 3,978.26/x
  3. Step 3: Cross multiply
    8,905.22x = 13,360.90 × 3,978.26
  4. Step 4: Simplify right side
    8,905.22x = 53,153,134.03
  5. Step 5: Solve for x
    x = 53,153,134.03/8,905.22
  6. Step 6: Final answer
    x = 5,968.76

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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.