Home / 20,912.40-31,392.90-12,601.80

Finding the Fourth Proportional to 20,912.40, 31,392.90 and 12,601.80

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Solution

The fourth proportional to 20,912.40, 31,392.90 and 12,601.80 is: 18,917.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.40 : 31,392.90 = 12,601.80 : x
  2. Step 2: Convert to fraction form
    20,912.40/31,392.90 = 12,601.80/x
  3. Step 3: Cross multiply
    20,912.40x = 31,392.90 × 12,601.80
  4. Step 4: Simplify right side
    20,912.40x = 395,607,047.22
  5. Step 5: Solve for x
    x = 395,607,047.22/20,912.40
  6. Step 6: Final answer
    x = 18,917.34

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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.