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Finding the Fourth Proportional to 79,993.76, 119,990.64 and 20,829.26

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Solution

The fourth proportional to 79,993.76, 119,990.64 and 20,829.26 is: 31,243.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,993.76 : 119,990.64 = 20,829.26 : x
  2. Step 2: Convert to fraction form
    79,993.76/119,990.64 = 20,829.26/x
  3. Step 3: Cross multiply
    79,993.76x = 119,990.64 × 20,829.26
  4. Step 4: Simplify right side
    79,993.76x = 2,499,315,638.17
  5. Step 5: Solve for x
    x = 2,499,315,638.17/79,993.76
  6. Step 6: Final answer
    x = 31,243.88

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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.