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Finding the Fourth Proportional to 13,389.80, 20,127.90 and 12,612.20

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Solution

The fourth proportional to 13,389.80, 20,127.90 and 12,612.20 is: 18,958.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,389.80 : 20,127.90 = 12,612.20 : x
  2. Step 2: Convert to fraction form
    13,389.80/20,127.90 = 12,612.20/x
  3. Step 3: Cross multiply
    13,389.80x = 20,127.90 × 12,612.20
  4. Step 4: Simplify right side
    13,389.80x = 253,857,100.38
  5. Step 5: Solve for x
    x = 253,857,100.38/13,389.80
  6. Step 6: Final answer
    x = 18,958.99

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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.