Home / 20,880.40-31,321.80-6,091.60

Finding the Fourth Proportional to 20,880.40, 31,321.80 and 6,091.60

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Solution

The fourth proportional to 20,880.40, 31,321.80 and 6,091.60 is: 9,137.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,880.40 : 31,321.80 = 6,091.60 : x
  2. Step 2: Convert to fraction form
    20,880.40/31,321.80 = 6,091.60/x
  3. Step 3: Cross multiply
    20,880.40x = 31,321.80 × 6,091.60
  4. Step 4: Simplify right side
    20,880.40x = 190,799,876.88
  5. Step 5: Solve for x
    x = 190,799,876.88/20,880.40
  6. Step 6: Final answer
    x = 9,137.75

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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.