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Finding the Fourth Proportional to 66,651.28, 91,978.82 and 38,356.96

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Solution

The fourth proportional to 66,651.28, 91,978.82 and 38,356.96 is: 52,932.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,651.28 : 91,978.82 = 38,356.96 : x
  2. Step 2: Convert to fraction form
    66,651.28/91,978.82 = 38,356.96/x
  3. Step 3: Cross multiply
    66,651.28x = 91,978.82 × 38,356.96
  4. Step 4: Simplify right side
    66,651.28x = 3,528,027,919.59
  5. Step 5: Solve for x
    x = 3,528,027,919.59/66,651.28
  6. Step 6: Final answer
    x = 52,932.64

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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.