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Finding the Fourth Proportional to 66,021.69, 91,121.58 and 39,179

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Solution

The fourth proportional to 66,021.69, 91,121.58 and 39,179 is: 54,073.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,021.69 : 91,121.58 = 39,179 : x
  2. Step 2: Convert to fraction form
    66,021.69/91,121.58 = 39,179/x
  3. Step 3: Cross multiply
    66,021.69x = 91,121.58 × 39,179
  4. Step 4: Simplify right side
    66,021.69x = 3,570,052,382.82
  5. Step 5: Solve for x
    x = 3,570,052,382.82/66,021.69
  6. Step 6: Final answer
    x = 54,073.93

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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.