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Finding the Fourth Proportional to 66,967.80, 100,415.20 and 20,214.60

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Solution

The fourth proportional to 66,967.80, 100,415.20 and 20,214.60 is: 30,310.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,967.80 : 100,415.20 = 20,214.60 : x
  2. Step 2: Convert to fraction form
    66,967.80/100,415.20 = 20,214.60/x
  3. Step 3: Cross multiply
    66,967.80x = 100,415.20 × 20,214.60
  4. Step 4: Simplify right side
    66,967.80x = 2,029,853,101.92
  5. Step 5: Solve for x
    x = 2,029,853,101.92/66,967.80
  6. Step 6: Final answer
    x = 30,310.88

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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.