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Finding the Fourth Proportional to 70,581.05, 105,885.35 and 20,661.96

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Solution

The fourth proportional to 70,581.05, 105,885.35 and 20,661.96 is: 30,996.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,581.05 : 105,885.35 = 20,661.96 : x
  2. Step 2: Convert to fraction form
    70,581.05/105,885.35 = 20,661.96/x
  3. Step 3: Cross multiply
    70,581.05x = 105,885.35 × 20,661.96
  4. Step 4: Simplify right side
    70,581.05x = 2,187,798,762.98
  5. Step 5: Solve for x
    x = 2,187,798,762.98/70,581.05
  6. Step 6: Final answer
    x = 30,996.97

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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.