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Finding the Fourth Proportional to 82,486.40, 123,729.60 and 68,662.40

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Solution

The fourth proportional to 82,486.40, 123,729.60 and 68,662.40 is: 102,993.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,486.40 : 123,729.60 = 68,662.40 : x
  2. Step 2: Convert to fraction form
    82,486.40/123,729.60 = 68,662.40/x
  3. Step 3: Cross multiply
    82,486.40x = 123,729.60 × 68,662.40
  4. Step 4: Simplify right side
    82,486.40x = 8,495,571,287.04
  5. Step 5: Solve for x
    x = 8,495,571,287.04/82,486.40
  6. Step 6: Final answer
    x = 102,993.60

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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.