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Finding the Fourth Proportional to 82,485.80, 123,987.90 and 80,930.60

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Solution

The fourth proportional to 82,485.80, 123,987.90 and 80,930.60 is: 121,650.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,485.80 : 123,987.90 = 80,930.60 : x
  2. Step 2: Convert to fraction form
    82,485.80/123,987.90 = 80,930.60/x
  3. Step 3: Cross multiply
    82,485.80x = 123,987.90 × 80,930.60
  4. Step 4: Simplify right side
    82,485.80x = 10,034,415,139.74
  5. Step 5: Solve for x
    x = 10,034,415,139.74/82,485.80
  6. Step 6: Final answer
    x = 121,650.21

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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.