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Finding the Fourth Proportional to 67,990.89, 102,004.79 and 20,604.07

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Solution

The fourth proportional to 67,990.89, 102,004.79 and 20,604.07 is: 30,911.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,990.89 : 102,004.79 = 20,604.07 : x
  2. Step 2: Convert to fraction form
    67,990.89/102,004.79 = 20,604.07/x
  3. Step 3: Cross multiply
    67,990.89x = 102,004.79 × 20,604.07
  4. Step 4: Simplify right side
    67,990.89x = 2,101,713,220.45
  5. Step 5: Solve for x
    x = 2,101,713,220.45/67,990.89
  6. Step 6: Final answer
    x = 30,911.69

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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.