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Finding the Fourth Proportional to 131,063.40, 196,740.90 and 81,199.80

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Solution

The fourth proportional to 131,063.40, 196,740.90 and 81,199.80 is: 121,890.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,063.40 : 196,740.90 = 81,199.80 : x
  2. Step 2: Convert to fraction form
    131,063.40/196,740.90 = 81,199.80/x
  3. Step 3: Cross multiply
    131,063.40x = 196,740.90 × 81,199.80
  4. Step 4: Simplify right side
    131,063.40x = 15,975,321,731.82
  5. Step 5: Solve for x
    x = 15,975,321,731.82/131,063.40
  6. Step 6: Final answer
    x = 121,890.03

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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.