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Finding the Fourth Proportional to 279,145.62, 418,759.94 and 129,401.03

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Solution

The fourth proportional to 279,145.62, 418,759.94 and 129,401.03 is: 194,120.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,145.62 : 418,759.94 = 129,401.03 : x
  2. Step 2: Convert to fraction form
    279,145.62/418,759.94 = 129,401.03/x
  3. Step 3: Cross multiply
    279,145.62x = 418,759.94 × 129,401.03
  4. Step 4: Simplify right side
    279,145.62x = 54,187,968,929.14
  5. Step 5: Solve for x
    x = 54,187,968,929.14/279,145.62
  6. Step 6: Final answer
    x = 194,120.79

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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.