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Finding the Fourth Proportional to 78,287.67, 117,428.31 and 36,153.90

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Solution

The fourth proportional to 78,287.67, 117,428.31 and 36,153.90 is: 54,229.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,287.67 : 117,428.31 = 36,153.90 : x
  2. Step 2: Convert to fraction form
    78,287.67/117,428.31 = 36,153.90/x
  3. Step 3: Cross multiply
    78,287.67x = 117,428.31 × 36,153.90
  4. Step 4: Simplify right side
    78,287.67x = 4,245,491,376.91
  5. Step 5: Solve for x
    x = 4,245,491,376.91/78,287.67
  6. Step 6: Final answer
    x = 54,229.37

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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.