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Finding the Fourth Proportional to 78,919.60, 118,912.20 and 65,187.29

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Solution

The fourth proportional to 78,919.60, 118,912.20 and 65,187.29 is: 98,221.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,919.60 : 118,912.20 = 65,187.29 : x
  2. Step 2: Convert to fraction form
    78,919.60/118,912.20 = 65,187.29/x
  3. Step 3: Cross multiply
    78,919.60x = 118,912.20 × 65,187.29
  4. Step 4: Simplify right side
    78,919.60x = 7,751,564,652.66
  5. Step 5: Solve for x
    x = 7,751,564,652.66/78,919.60
  6. Step 6: Final answer
    x = 98,221.03

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.