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Finding the Fourth Proportional to 66,728.68, 92,076.50 and 39,865.50

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Solution

The fourth proportional to 66,728.68, 92,076.50 and 39,865.50 is: 55,008.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,728.68 : 92,076.50 = 39,865.50 : x
  2. Step 2: Convert to fraction form
    66,728.68/92,076.50 = 39,865.50/x
  3. Step 3: Cross multiply
    66,728.68x = 92,076.50 × 39,865.50
  4. Step 4: Simplify right side
    66,728.68x = 3,670,675,710.75
  5. Step 5: Solve for x
    x = 3,670,675,710.75/66,728.68
  6. Step 6: Final answer
    x = 55,008.97

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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.