Home / 20,709.20-31,063.80-11,936.90

Finding the Fourth Proportional to 20,709.20, 31,063.80 and 11,936.90

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Solution

The fourth proportional to 20,709.20, 31,063.80 and 11,936.90 is: 17,905.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,709.20 : 31,063.80 = 11,936.90 : x
  2. Step 2: Convert to fraction form
    20,709.20/31,063.80 = 11,936.90/x
  3. Step 3: Cross multiply
    20,709.20x = 31,063.80 × 11,936.90
  4. Step 4: Simplify right side
    20,709.20x = 370,805,474.22
  5. Step 5: Solve for x
    x = 370,805,474.22/20,709.20
  6. Step 6: Final answer
    x = 17,905.35

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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.