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Finding the Fourth Proportional to 67,899.61, 101,850.18 and 20,515.09

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Solution

The fourth proportional to 67,899.61, 101,850.18 and 20,515.09 is: 30,772.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,899.61 : 101,850.18 = 20,515.09 : x
  2. Step 2: Convert to fraction form
    67,899.61/101,850.18 = 20,515.09/x
  3. Step 3: Cross multiply
    67,899.61x = 101,850.18 × 20,515.09
  4. Step 4: Simplify right side
    67,899.61x = 2,089,465,609.22
  5. Step 5: Solve for x
    x = 2,089,465,609.22/67,899.61
  6. Step 6: Final answer
    x = 30,772.87

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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.