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Finding the Fourth Proportional to 143,321.68, 197,790.06 and 79,660

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Solution

The fourth proportional to 143,321.68, 197,790.06 and 79,660 is: 109,934.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,321.68 : 197,790.06 = 79,660 : x
  2. Step 2: Convert to fraction form
    143,321.68/197,790.06 = 79,660/x
  3. Step 3: Cross multiply
    143,321.68x = 197,790.06 × 79,660
  4. Step 4: Simplify right side
    143,321.68x = 15,755,956,179.60
  5. Step 5: Solve for x
    x = 15,755,956,179.60/143,321.68
  6. Step 6: Final answer
    x = 109,934.21

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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.