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Finding the Fourth Proportional to 20,638.64, 30,957.96 and 8,318

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Solution

The fourth proportional to 20,638.64, 30,957.96 and 8,318 is: 12,477

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.64 : 30,957.96 = 8,318 : x
  2. Step 2: Convert to fraction form
    20,638.64/30,957.96 = 8,318/x
  3. Step 3: Cross multiply
    20,638.64x = 30,957.96 × 8,318
  4. Step 4: Simplify right side
    20,638.64x = 257,508,311.28
  5. Step 5: Solve for x
    x = 257,508,311.28/20,638.64
  6. Step 6: Final answer
    x = 12,477

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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.