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Finding the Fourth Proportional to 68,757.40, 103,165.50 and 28,785.72

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Solution

The fourth proportional to 68,757.40, 103,165.50 and 28,785.72 is: 43,190.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,757.40 : 103,165.50 = 28,785.72 : x
  2. Step 2: Convert to fraction form
    68,757.40/103,165.50 = 28,785.72/x
  3. Step 3: Cross multiply
    68,757.40x = 103,165.50 × 28,785.72
  4. Step 4: Simplify right side
    68,757.40x = 2,969,693,196.66
  5. Step 5: Solve for x
    x = 2,969,693,196.66/68,757.40
  6. Step 6: Final answer
    x = 43,190.89

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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.