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Finding the Fourth Proportional to 141,137.65, 211,638.43 and 81,990.24

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Solution

The fourth proportional to 141,137.65, 211,638.43 and 81,990.24 is: 122,945.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,137.65 : 211,638.43 = 81,990.24 : x
  2. Step 2: Convert to fraction form
    141,137.65/211,638.43 = 81,990.24/x
  3. Step 3: Cross multiply
    141,137.65x = 211,638.43 × 81,990.24
  4. Step 4: Simplify right side
    141,137.65x = 17,352,285,668.92
  5. Step 5: Solve for x
    x = 17,352,285,668.92/141,137.65
  6. Step 6: Final answer
    x = 122,945.83

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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.