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Finding the Fourth Proportional to 170,720.80, 256,081.20 and 82,147.30

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Solution

The fourth proportional to 170,720.80, 256,081.20 and 82,147.30 is: 123,220.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,720.80 : 256,081.20 = 82,147.30 : x
  2. Step 2: Convert to fraction form
    170,720.80/256,081.20 = 82,147.30/x
  3. Step 3: Cross multiply
    170,720.80x = 256,081.20 × 82,147.30
  4. Step 4: Simplify right side
    170,720.80x = 21,036,379,160.76
  5. Step 5: Solve for x
    x = 21,036,379,160.76/170,720.80
  6. Step 6: Final answer
    x = 123,220.95

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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.