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Finding the Fourth Proportional to 82,504.80, 123,854.40 and 81,921.60

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Solution

The fourth proportional to 82,504.80, 123,854.40 and 81,921.60 is: 122,978.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,504.80 : 123,854.40 = 81,921.60 : x
  2. Step 2: Convert to fraction form
    82,504.80/123,854.40 = 81,921.60/x
  3. Step 3: Cross multiply
    82,504.80x = 123,854.40 × 81,921.60
  4. Step 4: Simplify right side
    82,504.80x = 10,146,350,615.04
  5. Step 5: Solve for x
    x = 10,146,350,615.04/82,504.80
  6. Step 6: Final answer
    x = 122,978.91

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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.