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Finding the Fourth Proportional to 66,645.32, 91,964.21 and 36,428.72

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Solution

The fourth proportional to 66,645.32, 91,964.21 and 36,428.72 is: 50,268.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,645.32 : 91,964.21 = 36,428.72 : x
  2. Step 2: Convert to fraction form
    66,645.32/91,964.21 = 36,428.72/x
  3. Step 3: Cross multiply
    66,645.32x = 91,964.21 × 36,428.72
  4. Step 4: Simplify right side
    66,645.32x = 3,350,137,814.15
  5. Step 5: Solve for x
    x = 3,350,137,814.15/66,645.32
  6. Step 6: Final answer
    x = 50,268.17

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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.