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Finding the Fourth Proportional to 78,791.20, 118,186.80 and 75,680.80

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Solution

The fourth proportional to 78,791.20, 118,186.80 and 75,680.80 is: 113,521.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,791.20 : 118,186.80 = 75,680.80 : x
  2. Step 2: Convert to fraction form
    78,791.20/118,186.80 = 75,680.80/x
  3. Step 3: Cross multiply
    78,791.20x = 118,186.80 × 75,680.80
  4. Step 4: Simplify right side
    78,791.20x = 8,944,471,573.44
  5. Step 5: Solve for x
    x = 8,944,471,573.44/78,791.20
  6. Step 6: Final answer
    x = 113,521.20

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1.5x scale

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.