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Finding the Fourth Proportional to 129,790, 179,110.20 and 70,174

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Solution

The fourth proportional to 129,790, 179,110.20 and 70,174 is: 96,840.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,790 : 179,110.20 = 70,174 : x
  2. Step 2: Convert to fraction form
    129,790/179,110.20 = 70,174/x
  3. Step 3: Cross multiply
    129,790x = 179,110.20 × 70,174
  4. Step 4: Simplify right side
    129,790x = 12,568,879,174.80
  5. Step 5: Solve for x
    x = 12,568,879,174.80/129,790
  6. Step 6: Final answer
    x = 96,840.12

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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.