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Finding the Fourth Proportional to 129,635, 178,896.42 and 70,019

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Solution

The fourth proportional to 129,635, 178,896.42 and 70,019 is: 96,626.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,635 : 178,896.42 = 70,019 : x
  2. Step 2: Convert to fraction form
    129,635/178,896.42 = 70,019/x
  3. Step 3: Cross multiply
    129,635x = 178,896.42 × 70,019
  4. Step 4: Simplify right side
    129,635x = 12,526,148,431.98
  5. Step 5: Solve for x
    x = 12,526,148,431.98/129,635
  6. Step 6: Final answer
    x = 96,626.28

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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.