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Finding the Fourth Proportional to 66,421.82, 91,660.28 and 36,207.72

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Solution

The fourth proportional to 66,421.82, 91,660.28 and 36,207.72 is: 49,965.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,421.82 : 91,660.28 = 36,207.72 : x
  2. Step 2: Convert to fraction form
    66,421.82/91,660.28 = 36,207.72/x
  3. Step 3: Cross multiply
    66,421.82x = 91,660.28 × 36,207.72
  4. Step 4: Simplify right side
    66,421.82x = 3,318,809,572.32
  5. Step 5: Solve for x
    x = 3,318,809,572.32/66,421.82
  6. Step 6: Final answer
    x = 49,965.66

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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.