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Finding the Fourth Proportional to 78,912.90, 108,902.16 and 43,104.60

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Solution

The fourth proportional to 78,912.90, 108,902.16 and 43,104.60 is: 59,485.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,912.90 : 108,902.16 = 43,104.60 : x
  2. Step 2: Convert to fraction form
    78,912.90/108,902.16 = 43,104.60/x
  3. Step 3: Cross multiply
    78,912.90x = 108,902.16 × 43,104.60
  4. Step 4: Simplify right side
    78,912.90x = 4,694,184,045.94
  5. Step 5: Solve for x
    x = 4,694,184,045.94/78,912.90
  6. Step 6: Final answer
    x = 59,485.64

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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.