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Finding the Fourth Proportional to 20,689.70, 30,998.10 and 16,971.80

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Solution

The fourth proportional to 20,689.70, 30,998.10 and 16,971.80 is: 25,427.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.70 : 30,998.10 = 16,971.80 : x
  2. Step 2: Convert to fraction form
    20,689.70/30,998.10 = 16,971.80/x
  3. Step 3: Cross multiply
    20,689.70x = 30,998.10 × 16,971.80
  4. Step 4: Simplify right side
    20,689.70x = 526,093,553.58
  5. Step 5: Solve for x
    x = 526,093,553.58/20,689.70
  6. Step 6: Final answer
    x = 25,427.80

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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.