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Finding the Fourth Proportional to 80,972.40, 121,429.80 and 36,620.40

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Solution

The fourth proportional to 80,972.40, 121,429.80 and 36,620.40 is: 54,917.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,972.40 : 121,429.80 = 36,620.40 : x
  2. Step 2: Convert to fraction form
    80,972.40/121,429.80 = 36,620.40/x
  3. Step 3: Cross multiply
    80,972.40x = 121,429.80 × 36,620.40
  4. Step 4: Simplify right side
    80,972.40x = 4,446,807,847.92
  5. Step 5: Solve for x
    x = 4,446,807,847.92/80,972.40
  6. Step 6: Final answer
    x = 54,917.57

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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.