Home / 20,117.20-30,179.40-8,431.60

Finding the Fourth Proportional to 20,117.20, 30,179.40 and 8,431.60

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Solution

The fourth proportional to 20,117.20, 30,179.40 and 8,431.60 is: 12,648.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,117.20 : 30,179.40 = 8,431.60 : x
  2. Step 2: Convert to fraction form
    20,117.20/30,179.40 = 8,431.60/x
  3. Step 3: Cross multiply
    20,117.20x = 30,179.40 × 8,431.60
  4. Step 4: Simplify right side
    20,117.20x = 254,460,629.04
  5. Step 5: Solve for x
    x = 254,460,629.04/20,117.20
  6. Step 6: Final answer
    x = 12,648.91

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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.