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Finding the Fourth Proportional to 66,494.39, 91,749.74 and 39,639.42

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Solution

The fourth proportional to 66,494.39, 91,749.74 and 39,639.42 is: 54,694.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,494.39 : 91,749.74 = 39,639.42 : x
  2. Step 2: Convert to fraction form
    66,494.39/91,749.74 = 39,639.42/x
  3. Step 3: Cross multiply
    66,494.39x = 91,749.74 × 39,639.42
  4. Step 4: Simplify right side
    66,494.39x = 3,636,906,280.55
  5. Step 5: Solve for x
    x = 3,636,906,280.55/66,494.39
  6. Step 6: Final answer
    x = 54,694.94

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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.