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Finding the Fourth Proportional to 85,812.44, 128,578.08 and 82,532

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Solution

The fourth proportional to 85,812.44, 128,578.08 and 82,532 is: 123,662.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812.44 : 128,578.08 = 82,532 : x
  2. Step 2: Convert to fraction form
    85,812.44/128,578.08 = 82,532/x
  3. Step 3: Cross multiply
    85,812.44x = 128,578.08 × 82,532
  4. Step 4: Simplify right side
    85,812.44x = 10,611,806,098.56
  5. Step 5: Solve for x
    x = 10,611,806,098.56/85,812.44
  6. Step 6: Final answer
    x = 123,662.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.