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Finding the Fourth Proportional to 20,494.80, 30,742.20 and 20,187.60

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Solution

The fourth proportional to 20,494.80, 30,742.20 and 20,187.60 is: 30,281.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,494.80 : 30,742.20 = 20,187.60 : x
  2. Step 2: Convert to fraction form
    20,494.80/30,742.20 = 20,187.60/x
  3. Step 3: Cross multiply
    20,494.80x = 30,742.20 × 20,187.60
  4. Step 4: Simplify right side
    20,494.80x = 620,611,236.72
  5. Step 5: Solve for x
    x = 620,611,236.72/20,494.80
  6. Step 6: Final answer
    x = 30,281.40

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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.