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Finding the Fourth Proportional to 66,489.53, 91,742.99 and 39,634.54

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Solution

The fourth proportional to 66,489.53, 91,742.99 and 39,634.54 is: 54,688.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,489.53 : 91,742.99 = 39,634.54 : x
  2. Step 2: Convert to fraction form
    66,489.53/91,742.99 = 39,634.54/x
  3. Step 3: Cross multiply
    66,489.53x = 91,742.99 × 39,634.54
  4. Step 4: Simplify right side
    66,489.53x = 3,636,191,076.60
  5. Step 5: Solve for x
    x = 3,636,191,076.60/66,489.53
  6. Step 6: Final answer
    x = 54,688.18

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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.