Home / 20,109.60-30,178.80-8,431.20

Finding the Fourth Proportional to 20,109.60, 30,178.80 and 8,431.20

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Solution

The fourth proportional to 20,109.60, 30,178.80 and 8,431.20 is: 12,652.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,109.60 : 30,178.80 = 8,431.20 : x
  2. Step 2: Convert to fraction form
    20,109.60/30,178.80 = 8,431.20/x
  3. Step 3: Cross multiply
    20,109.60x = 30,178.80 × 8,431.20
  4. Step 4: Simplify right side
    20,109.60x = 254,443,498.56
  5. Step 5: Solve for x
    x = 254,443,498.56/20,109.60
  6. Step 6: Final answer
    x = 12,652.84

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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.