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Finding the Fourth Proportional to 71,979.60, 107,920.80 and 36,890.40

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Solution

The fourth proportional to 71,979.60, 107,920.80 and 36,890.40 is: 55,310.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,979.60 : 107,920.80 = 36,890.40 : x
  2. Step 2: Convert to fraction form
    71,979.60/107,920.80 = 36,890.40/x
  3. Step 3: Cross multiply
    71,979.60x = 107,920.80 × 36,890.40
  4. Step 4: Simplify right side
    71,979.60x = 3,981,241,480.32
  5. Step 5: Solve for x
    x = 3,981,241,480.32/71,979.60
  6. Step 6: Final answer
    x = 55,310.69

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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.