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Finding the Fourth Proportional to 279,136.16, 418,705.80 and 68,772.56

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Solution

The fourth proportional to 279,136.16, 418,705.80 and 68,772.56 is: 103,159.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,136.16 : 418,705.80 = 68,772.56 : x
  2. Step 2: Convert to fraction form
    279,136.16/418,705.80 = 68,772.56/x
  3. Step 3: Cross multiply
    279,136.16x = 418,705.80 × 68,772.56
  4. Step 4: Simplify right side
    279,136.16x = 28,795,469,752.85
  5. Step 5: Solve for x
    x = 28,795,469,752.85/279,136.16
  6. Step 6: Final answer
    x = 103,159.22

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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.