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Finding the Fourth Proportional to 66,729, 92,067.90 and 39,859.56

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Solution

The fourth proportional to 66,729, 92,067.90 and 39,859.56 is: 54,995.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,729 : 92,067.90 = 39,859.56 : x
  2. Step 2: Convert to fraction form
    66,729/92,067.90 = 39,859.56/x
  3. Step 3: Cross multiply
    66,729x = 92,067.90 × 39,859.56
  4. Step 4: Simplify right side
    66,729x = 3,669,785,984.12
  5. Step 5: Solve for x
    x = 3,669,785,984.12/66,729
  6. Step 6: Final answer
    x = 54,995.37

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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.