Home / 20,868.12-31,323.24-12,120.12

Finding the Fourth Proportional to 20,868.12, 31,323.24 and 12,120.12

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Solution

The fourth proportional to 20,868.12, 31,323.24 and 12,120.12 is: 18,192.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.12 : 31,323.24 = 12,120.12 : x
  2. Step 2: Convert to fraction form
    20,868.12/31,323.24 = 12,120.12/x
  3. Step 3: Cross multiply
    20,868.12x = 31,323.24 × 12,120.12
  4. Step 4: Simplify right side
    20,868.12x = 379,641,427.59
  5. Step 5: Solve for x
    x = 379,641,427.59/20,868.12
  6. Step 6: Final answer
    x = 18,192.41

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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.