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Finding the Fourth Proportional to 68,872.60, 103,136.10 and 45,371.80

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Solution

The fourth proportional to 68,872.60, 103,136.10 and 45,371.80 is: 67,943.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,872.60 : 103,136.10 = 45,371.80 : x
  2. Step 2: Convert to fraction form
    68,872.60/103,136.10 = 45,371.80/x
  3. Step 3: Cross multiply
    68,872.60x = 103,136.10 × 45,371.80
  4. Step 4: Simplify right side
    68,872.60x = 4,679,470,501.98
  5. Step 5: Solve for x
    x = 4,679,470,501.98/68,872.60
  6. Step 6: Final answer
    x = 67,943.86

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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.