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Finding the Fourth Proportional to 143,136, 197,519.94 and 79,469.70

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Solution

The fourth proportional to 143,136, 197,519.94 and 79,469.70 is: 109,663.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,136 : 197,519.94 = 79,469.70 : x
  2. Step 2: Convert to fraction form
    143,136/197,519.94 = 79,469.70/x
  3. Step 3: Cross multiply
    143,136x = 197,519.94 × 79,469.70
  4. Step 4: Simplify right side
    143,136x = 15,696,850,375.82
  5. Step 5: Solve for x
    x = 15,696,850,375.82/143,136
  6. Step 6: Final answer
    x = 109,663.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.