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Finding the Fourth Proportional to 80,679.60, 121,019.40 and 45,687.60

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Solution

The fourth proportional to 80,679.60, 121,019.40 and 45,687.60 is: 68,531.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,679.60 : 121,019.40 = 45,687.60 : x
  2. Step 2: Convert to fraction form
    80,679.60/121,019.40 = 45,687.60/x
  3. Step 3: Cross multiply
    80,679.60x = 121,019.40 × 45,687.60
  4. Step 4: Simplify right side
    80,679.60x = 5,529,085,939.44
  5. Step 5: Solve for x
    x = 5,529,085,939.44/80,679.60
  6. Step 6: Final answer
    x = 68,531.40

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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.