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Finding the Fourth Proportional to 78,909.89, 108,895.32 and 43,099.92

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Solution

The fourth proportional to 78,909.89, 108,895.32 and 43,099.92 is: 59,477.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,909.89 : 108,895.32 = 43,099.92 : x
  2. Step 2: Convert to fraction form
    78,909.89/108,895.32 = 43,099.92/x
  3. Step 3: Cross multiply
    78,909.89x = 108,895.32 × 43,099.92
  4. Step 4: Simplify right side
    78,909.89x = 4,693,379,580.37
  5. Step 5: Solve for x
    x = 4,693,379,580.37/78,909.89
  6. Step 6: Final answer
    x = 59,477.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.