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Finding the Fourth Proportional to 129,756, 179,063.52 and 70,140

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Solution

The fourth proportional to 129,756, 179,063.52 and 70,140 is: 96,793.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,756 : 179,063.52 = 70,140 : x
  2. Step 2: Convert to fraction form
    129,756/179,063.52 = 70,140/x
  3. Step 3: Cross multiply
    129,756x = 179,063.52 × 70,140
  4. Step 4: Simplify right side
    129,756x = 12,559,515,292.80
  5. Step 5: Solve for x
    x = 12,559,515,292.80/129,756
  6. Step 6: Final answer
    x = 96,793.33

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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.