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Finding the Fourth Proportional to 170,757.70, 256,136.55 and 81,989.80

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Solution

The fourth proportional to 170,757.70, 256,136.55 and 81,989.80 is: 122,984.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,757.70 : 256,136.55 = 81,989.80 : x
  2. Step 2: Convert to fraction form
    170,757.70/256,136.55 = 81,989.80/x
  3. Step 3: Cross multiply
    170,757.70x = 256,136.55 × 81,989.80
  4. Step 4: Simplify right side
    170,757.70x = 21,000,584,507.19
  5. Step 5: Solve for x
    x = 21,000,584,507.19/170,757.70
  6. Step 6: Final answer
    x = 122,984.70

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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.