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Finding the Fourth Proportional to 78,940.80, 118,411.20 and 72,489.60

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Solution

The fourth proportional to 78,940.80, 118,411.20 and 72,489.60 is: 108,734.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,940.80 : 118,411.20 = 72,489.60 : x
  2. Step 2: Convert to fraction form
    78,940.80/118,411.20 = 72,489.60/x
  3. Step 3: Cross multiply
    78,940.80x = 118,411.20 × 72,489.60
  4. Step 4: Simplify right side
    78,940.80x = 8,583,580,523.52
  5. Step 5: Solve for x
    x = 8,583,580,523.52/78,940.80
  6. Step 6: Final answer
    x = 108,734.40

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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.