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Finding the Fourth Proportional to 159,939.20, 240,103.20 and 81,012.80

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Solution

The fourth proportional to 159,939.20, 240,103.20 and 81,012.80 is: 121,617.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,939.20 : 240,103.20 = 81,012.80 : x
  2. Step 2: Convert to fraction form
    159,939.20/240,103.20 = 81,012.80/x
  3. Step 3: Cross multiply
    159,939.20x = 240,103.20 × 81,012.80
  4. Step 4: Simplify right side
    159,939.20x = 19,451,432,520.96
  5. Step 5: Solve for x
    x = 19,451,432,520.96/159,939.20
  6. Step 6: Final answer
    x = 121,617.67

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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.