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Finding the Fourth Proportional to 279,008.40, 418,513.82 and 68,645.73

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Solution

The fourth proportional to 279,008.40, 418,513.82 and 68,645.73 is: 102,968.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,008.40 : 418,513.82 = 68,645.73 : x
  2. Step 2: Convert to fraction form
    279,008.40/418,513.82 = 68,645.73/x
  3. Step 3: Cross multiply
    279,008.40x = 418,513.82 × 68,645.73
  4. Step 4: Simplify right side
    279,008.40x = 28,729,186,688.99
  5. Step 5: Solve for x
    x = 28,729,186,688.99/279,008.40
  6. Step 6: Final answer
    x = 102,968.90

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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.