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Finding the Fourth Proportional to 66,735.81, 92,086.31 and 39,872.61

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Solution

The fourth proportional to 66,735.81, 92,086.31 and 39,872.61 is: 55,018.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,735.81 : 92,086.31 = 39,872.61 : x
  2. Step 2: Convert to fraction form
    66,735.81/92,086.31 = 39,872.61/x
  3. Step 3: Cross multiply
    66,735.81x = 92,086.31 × 39,872.61
  4. Step 4: Simplify right side
    66,735.81x = 3,671,721,624.65
  5. Step 5: Solve for x
    x = 3,671,721,624.65/66,735.81
  6. Step 6: Final answer
    x = 55,018.76

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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.