Home / 20,994.72-31,450.20-12,649.56

Finding the Fourth Proportional to 20,994.72, 31,450.20 and 12,649.56

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Solution

The fourth proportional to 20,994.72, 31,450.20 and 12,649.56 is: 18,949.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,994.72 : 31,450.20 = 12,649.56 : x
  2. Step 2: Convert to fraction form
    20,994.72/31,450.20 = 12,649.56/x
  3. Step 3: Cross multiply
    20,994.72x = 31,450.20 × 12,649.56
  4. Step 4: Simplify right side
    20,994.72x = 397,831,191.91
  5. Step 5: Solve for x
    x = 397,831,191.91/20,994.72
  6. Step 6: Final answer
    x = 18,949.11

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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.