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Finding the Fourth Proportional to 129,786, 179,104.72 and 70,170

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Solution

The fourth proportional to 129,786, 179,104.72 and 70,170 is: 96,834.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,786 : 179,104.72 = 70,170 : x
  2. Step 2: Convert to fraction form
    129,786/179,104.72 = 70,170/x
  3. Step 3: Cross multiply
    129,786x = 179,104.72 × 70,170
  4. Step 4: Simplify right side
    129,786x = 12,567,778,202.40
  5. Step 5: Solve for x
    x = 12,567,778,202.40/129,786
  6. Step 6: Final answer
    x = 96,834.62

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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.