Home / 129,121.39-178,187.34-71,758.91

Finding the Fourth Proportional to 129,121.39, 178,187.34 and 71,758.91

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Solution

The fourth proportional to 129,121.39, 178,187.34 and 71,758.91 is: 99,027.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,121.39 : 178,187.34 = 71,758.91 : x
  2. Step 2: Convert to fraction form
    129,121.39/178,187.34 = 71,758.91/x
  3. Step 3: Cross multiply
    129,121.39x = 178,187.34 × 71,758.91
  4. Step 4: Simplify right side
    129,121.39x = 12,786,530,008.76
  5. Step 5: Solve for x
    x = 12,786,530,008.76/129,121.39
  6. Step 6: Final answer
    x = 99,027.20

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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.