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Finding the Fourth Proportional to 20,525.76, 30,791.92 and 8,679.64

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Solution

The fourth proportional to 20,525.76, 30,791.92 and 8,679.64 is: 13,020.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,525.76 : 30,791.92 = 8,679.64 : x
  2. Step 2: Convert to fraction form
    20,525.76/30,791.92 = 8,679.64/x
  3. Step 3: Cross multiply
    20,525.76x = 30,791.92 × 8,679.64
  4. Step 4: Simplify right side
    20,525.76x = 267,262,780.51
  5. Step 5: Solve for x
    x = 267,262,780.51/20,525.76
  6. Step 6: Final answer
    x = 13,020.85

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1.5x scale

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.