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Finding the Fourth Proportional to 67,991.39, 102,005.54 and 20,604.57

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Solution

The fourth proportional to 67,991.39, 102,005.54 and 20,604.57 is: 30,912.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,991.39 : 102,005.54 = 20,604.57 : x
  2. Step 2: Convert to fraction form
    67,991.39/102,005.54 = 20,604.57/x
  3. Step 3: Cross multiply
    67,991.39x = 102,005.54 × 20,604.57
  4. Step 4: Simplify right side
    67,991.39x = 2,101,780,289.32
  5. Step 5: Solve for x
    x = 2,101,780,289.32/67,991.39
  6. Step 6: Final answer
    x = 30,912.45

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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.