Home / 20,999.80-31,434.90-12,208.60

Finding the Fourth Proportional to 20,999.80, 31,434.90 and 12,208.60

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Solution

The fourth proportional to 20,999.80, 31,434.90 and 12,208.60 is: 18,275.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.80 : 31,434.90 = 12,208.60 : x
  2. Step 2: Convert to fraction form
    20,999.80/31,434.90 = 12,208.60/x
  3. Step 3: Cross multiply
    20,999.80x = 31,434.90 × 12,208.60
  4. Step 4: Simplify right side
    20,999.80x = 383,776,120.14
  5. Step 5: Solve for x
    x = 383,776,120.14/20,999.80
  6. Step 6: Final answer
    x = 18,275.23

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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.