Home / 20,311.60-30,485.40-11,981.20

Finding the Fourth Proportional to 20,311.60, 30,485.40 and 11,981.20

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Solution

The fourth proportional to 20,311.60, 30,485.40 and 11,981.20 is: 17,982.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,311.60 : 30,485.40 = 11,981.20 : x
  2. Step 2: Convert to fraction form
    20,311.60/30,485.40 = 11,981.20/x
  3. Step 3: Cross multiply
    20,311.60x = 30,485.40 × 11,981.20
  4. Step 4: Simplify right side
    20,311.60x = 365,251,674.48
  5. Step 5: Solve for x
    x = 365,251,674.48/20,311.60
  6. Step 6: Final answer
    x = 17,982.42

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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.