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Finding the Fourth Proportional to 79,945.60, 119,918.40 and 66,920.80

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Solution

The fourth proportional to 79,945.60, 119,918.40 and 66,920.80 is: 100,381.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,945.60 : 119,918.40 = 66,920.80 : x
  2. Step 2: Convert to fraction form
    79,945.60/119,918.40 = 66,920.80/x
  3. Step 3: Cross multiply
    79,945.60x = 119,918.40 × 66,920.80
  4. Step 4: Simplify right side
    79,945.60x = 8,025,035,262.72
  5. Step 5: Solve for x
    x = 8,025,035,262.72/79,945.60
  6. Step 6: Final answer
    x = 100,381.20

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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.