Home / 20,765.60-31,148.40-6,912.80

Finding the Fourth Proportional to 20,765.60, 31,148.40 and 6,912.80

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Solution

The fourth proportional to 20,765.60, 31,148.40 and 6,912.80 is: 10,369.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,765.60 : 31,148.40 = 6,912.80 : x
  2. Step 2: Convert to fraction form
    20,765.60/31,148.40 = 6,912.80/x
  3. Step 3: Cross multiply
    20,765.60x = 31,148.40 × 6,912.80
  4. Step 4: Simplify right side
    20,765.60x = 215,322,659.52
  5. Step 5: Solve for x
    x = 215,322,659.52/20,765.60
  6. Step 6: Final answer
    x = 10,369.20

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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.