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Finding the Fourth Proportional to 66,489.66, 91,743.16 and 39,634.64

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Solution

The fourth proportional to 66,489.66, 91,743.16 and 39,634.64 is: 54,688.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,489.66 : 91,743.16 = 39,634.64 : x
  2. Step 2: Convert to fraction form
    66,489.66/91,743.16 = 39,634.64/x
  3. Step 3: Cross multiply
    66,489.66x = 91,743.16 × 39,634.64
  4. Step 4: Simplify right side
    66,489.66x = 3,636,207,119.06
  5. Step 5: Solve for x
    x = 3,636,207,119.06/66,489.66
  6. Step 6: Final answer
    x = 54,688.31

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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.