Home / 129,106.20-178,161.82-71,749.09

Finding the Fourth Proportional to 129,106.20, 178,161.82 and 71,749.09

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Solution

The fourth proportional to 129,106.20, 178,161.82 and 71,749.09 is: 99,011.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,106.20 : 178,161.82 = 71,749.09 : x
  2. Step 2: Convert to fraction form
    129,106.20/178,161.82 = 71,749.09/x
  3. Step 3: Cross multiply
    129,106.20x = 178,161.82 × 71,749.09
  4. Step 4: Simplify right side
    129,106.20x = 12,782,948,099.00
  5. Step 5: Solve for x
    x = 12,782,948,099.00/129,106.20
  6. Step 6: Final answer
    x = 99,011.11

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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.