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Finding the Fourth Proportional to 80,112.80, 119,938.80 and 77,808.80

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Solution

The fourth proportional to 80,112.80, 119,938.80 and 77,808.80 is: 116,489.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,112.80 : 119,938.80 = 77,808.80 : x
  2. Step 2: Convert to fraction form
    80,112.80/119,938.80 = 77,808.80/x
  3. Step 3: Cross multiply
    80,112.80x = 119,938.80 × 77,808.80
  4. Step 4: Simplify right side
    80,112.80x = 9,332,294,101.44
  5. Step 5: Solve for x
    x = 9,332,294,101.44/80,112.80
  6. Step 6: Final answer
    x = 116,489.43

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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.