Home / 20,993.31-31,485.27-12,661.85

Finding the Fourth Proportional to 20,993.31, 31,485.27 and 12,661.85

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Solution

The fourth proportional to 20,993.31, 31,485.27 and 12,661.85 is: 18,989.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.31 : 31,485.27 = 12,661.85 : x
  2. Step 2: Convert to fraction form
    20,993.31/31,485.27 = 12,661.85/x
  3. Step 3: Cross multiply
    20,993.31x = 31,485.27 × 12,661.85
  4. Step 4: Simplify right side
    20,993.31x = 398,661,702.64
  5. Step 5: Solve for x
    x = 398,661,702.64/20,993.31
  6. Step 6: Final answer
    x = 18,989.94

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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.