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Finding the Fourth Proportional to 85,992.70, 128,879.70 and 76,588.60

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Solution

The fourth proportional to 85,992.70, 128,879.70 and 76,588.60 is: 114,785.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,992.70 : 128,879.70 = 76,588.60 : x
  2. Step 2: Convert to fraction form
    85,992.70/128,879.70 = 76,588.60/x
  3. Step 3: Cross multiply
    85,992.70x = 128,879.70 × 76,588.60
  4. Step 4: Simplify right side
    85,992.70x = 9,870,715,791.42
  5. Step 5: Solve for x
    x = 9,870,715,791.42/85,992.70
  6. Step 6: Final answer
    x = 114,785.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.