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Finding the Fourth Proportional to 80,143.20, 120,214.80 and 78,976.80

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Solution

The fourth proportional to 80,143.20, 120,214.80 and 78,976.80 is: 118,465.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,143.20 : 120,214.80 = 78,976.80 : x
  2. Step 2: Convert to fraction form
    80,143.20/120,214.80 = 78,976.80/x
  3. Step 3: Cross multiply
    80,143.20x = 120,214.80 × 78,976.80
  4. Step 4: Simplify right side
    80,143.20x = 9,494,180,216.64
  5. Step 5: Solve for x
    x = 9,494,180,216.64/80,143.20
  6. Step 6: Final answer
    x = 118,465.20

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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.