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Finding the Fourth Proportional to 66,018, 91,105.20 and 39,174

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Solution

The fourth proportional to 66,018, 91,105.20 and 39,174 is: 54,060.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,018 : 91,105.20 = 39,174 : x
  2. Step 2: Convert to fraction form
    66,018/91,105.20 = 39,174/x
  3. Step 3: Cross multiply
    66,018x = 91,105.20 × 39,174
  4. Step 4: Simplify right side
    66,018x = 3,568,955,104.80
  5. Step 5: Solve for x
    x = 3,568,955,104.80/66,018
  6. Step 6: Final answer
    x = 54,060.33

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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.