Home / 129,105.45-178,160.78-71,748.34

Finding the Fourth Proportional to 129,105.45, 178,160.78 and 71,748.34

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Solution

The fourth proportional to 129,105.45, 178,160.78 and 71,748.34 is: 99,010.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,105.45 : 178,160.78 = 71,748.34 : x
  2. Step 2: Convert to fraction form
    129,105.45/178,160.78 = 71,748.34/x
  3. Step 3: Cross multiply
    129,105.45x = 178,160.78 × 71,748.34
  4. Step 4: Simplify right side
    129,105.45x = 12,782,739,952.07
  5. Step 5: Solve for x
    x = 12,782,739,952.07/129,105.45
  6. Step 6: Final answer
    x = 99,010.07

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1.5x scale

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.