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Finding the Fourth Proportional to 70,651.39, 105,993.50 and 20,729.47

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Solution

The fourth proportional to 70,651.39, 105,993.50 and 20,729.47 is: 31,099.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,651.39 : 105,993.50 = 20,729.47 : x
  2. Step 2: Convert to fraction form
    70,651.39/105,993.50 = 20,729.47/x
  3. Step 3: Cross multiply
    70,651.39x = 105,993.50 × 20,729.47
  4. Step 4: Simplify right side
    70,651.39x = 2,197,189,078.45
  5. Step 5: Solve for x
    x = 2,197,189,078.45/70,651.39
  6. Step 6: Final answer
    x = 31,099.02

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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.