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Finding the Fourth Proportional to 20,521.76, 30,785.92 and 8,675.64

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Solution

The fourth proportional to 20,521.76, 30,785.92 and 8,675.64 is: 13,014.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,521.76 : 30,785.92 = 8,675.64 : x
  2. Step 2: Convert to fraction form
    20,521.76/30,785.92 = 8,675.64/x
  3. Step 3: Cross multiply
    20,521.76x = 30,785.92 × 8,675.64
  4. Step 4: Simplify right side
    20,521.76x = 267,087,558.99
  5. Step 5: Solve for x
    x = 267,087,558.99/20,521.76
  6. Step 6: Final answer
    x = 13,014.85

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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.