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Finding the Fourth Proportional to 78,376.68, 117,748.22 and 74,128.43

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Solution

The fourth proportional to 78,376.68, 117,748.22 and 74,128.43 is: 111,365.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,376.68 : 117,748.22 = 74,128.43 : x
  2. Step 2: Convert to fraction form
    78,376.68/117,748.22 = 74,128.43/x
  3. Step 3: Cross multiply
    78,376.68x = 117,748.22 × 74,128.43
  4. Step 4: Simplify right side
    78,376.68x = 8,728,490,607.62
  5. Step 5: Solve for x
    x = 8,728,490,607.62/78,376.68
  6. Step 6: Final answer
    x = 111,365.91

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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.