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Finding the Fourth Proportional to 68,739.60, 103,109.40 and 51,243.60

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Solution

The fourth proportional to 68,739.60, 103,109.40 and 51,243.60 is: 76,865.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,739.60 : 103,109.40 = 51,243.60 : x
  2. Step 2: Convert to fraction form
    68,739.60/103,109.40 = 51,243.60/x
  3. Step 3: Cross multiply
    68,739.60x = 103,109.40 × 51,243.60
  4. Step 4: Simplify right side
    68,739.60x = 5,283,696,849.84
  5. Step 5: Solve for x
    x = 5,283,696,849.84/68,739.60
  6. Step 6: Final answer
    x = 76,865.40

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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.