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Finding the Fourth Proportional to 268,276.80, 402,469.20 and 78,736.80

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Solution

The fourth proportional to 268,276.80, 402,469.20 and 78,736.80 is: 118,121.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,276.80 : 402,469.20 = 78,736.80 : x
  2. Step 2: Convert to fraction form
    268,276.80/402,469.20 = 78,736.80/x
  3. Step 3: Cross multiply
    268,276.80x = 402,469.20 × 78,736.80
  4. Step 4: Simplify right side
    268,276.80x = 31,689,136,906.56
  5. Step 5: Solve for x
    x = 31,689,136,906.56/268,276.80
  6. Step 6: Final answer
    x = 118,121.05

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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.