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Finding the Fourth Proportional to 20,123.60, 30,185.40 and 18,811.40

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Solution

The fourth proportional to 20,123.60, 30,185.40 and 18,811.40 is: 28,217.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,123.60 : 30,185.40 = 18,811.40 : x
  2. Step 2: Convert to fraction form
    20,123.60/30,185.40 = 18,811.40/x
  3. Step 3: Cross multiply
    20,123.60x = 30,185.40 × 18,811.40
  4. Step 4: Simplify right side
    20,123.60x = 567,829,633.56
  5. Step 5: Solve for x
    x = 567,829,633.56/20,123.60
  6. Step 6: Final answer
    x = 28,217.10

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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.