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Finding the Fourth Proportional to 66,769.80, 100,008.90 and 40,428.60

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Solution

The fourth proportional to 66,769.80, 100,008.90 and 40,428.60 is: 60,554.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,769.80 : 100,008.90 = 40,428.60 : x
  2. Step 2: Convert to fraction form
    66,769.80/100,008.90 = 40,428.60/x
  3. Step 3: Cross multiply
    66,769.80x = 100,008.90 × 40,428.60
  4. Step 4: Simplify right side
    66,769.80x = 4,043,219,814.54
  5. Step 5: Solve for x
    x = 4,043,219,814.54/66,769.80
  6. Step 6: Final answer
    x = 60,554.62

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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.