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Finding the Fourth Proportional to 20,808.99, 28,714.16 and 12,311.43

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Solution

The fourth proportional to 20,808.99, 28,714.16 and 12,311.43 is: 16,988.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.99 : 28,714.16 = 12,311.43 : x
  2. Step 2: Convert to fraction form
    20,808.99/28,714.16 = 12,311.43/x
  3. Step 3: Cross multiply
    20,808.99x = 28,714.16 × 12,311.43
  4. Step 4: Simplify right side
    20,808.99x = 353,512,309.29
  5. Step 5: Solve for x
    x = 353,512,309.29/20,808.99
  6. Step 6: Final answer
    x = 16,988.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.