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Finding the Fourth Proportional to 8,779.20, 13,147.20 and 5,072.64

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Solution

The fourth proportional to 8,779.20, 13,147.20 and 5,072.64 is: 7,596.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,779.20 : 13,147.20 = 5,072.64 : x
  2. Step 2: Convert to fraction form
    8,779.20/13,147.20 = 5,072.64/x
  3. Step 3: Cross multiply
    8,779.20x = 13,147.20 × 5,072.64
  4. Step 4: Simplify right side
    8,779.20x = 66,691,012.61
  5. Step 5: Solve for x
    x = 66,691,012.61/8,779.20
  6. Step 6: Final answer
    x = 7,596.48

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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.