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Finding the Fourth Proportional to 78,728.40, 118,092.60 and 73,479.60

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Solution

The fourth proportional to 78,728.40, 118,092.60 and 73,479.60 is: 110,219.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,728.40 : 118,092.60 = 73,479.60 : x
  2. Step 2: Convert to fraction form
    78,728.40/118,092.60 = 73,479.60/x
  3. Step 3: Cross multiply
    78,728.40x = 118,092.60 × 73,479.60
  4. Step 4: Simplify right side
    78,728.40x = 8,677,397,010.96
  5. Step 5: Solve for x
    x = 8,677,397,010.96/78,728.40
  6. Step 6: Final answer
    x = 110,219.40

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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.