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Finding the Fourth Proportional to 18,706.68, 25,815.20 and 11,992.30

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Solution

The fourth proportional to 18,706.68, 25,815.20 and 11,992.30 is: 16,549.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,706.68 : 25,815.20 = 11,992.30 : x
  2. Step 2: Convert to fraction form
    18,706.68/25,815.20 = 11,992.30/x
  3. Step 3: Cross multiply
    18,706.68x = 25,815.20 × 11,992.30
  4. Step 4: Simplify right side
    18,706.68x = 309,583,622.96
  5. Step 5: Solve for x
    x = 309,583,622.96/18,706.68
  6. Step 6: Final answer
    x = 16,549.36

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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.