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Finding the Fourth Proportional to 80,009.70, 120,011.40 and 20,845.86

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Solution

The fourth proportional to 80,009.70, 120,011.40 and 20,845.86 is: 31,267.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,009.70 : 120,011.40 = 20,845.86 : x
  2. Step 2: Convert to fraction form
    80,009.70/120,011.40 = 20,845.86/x
  3. Step 3: Cross multiply
    80,009.70x = 120,011.40 × 20,845.86
  4. Step 4: Simplify right side
    80,009.70x = 2,501,740,842.80
  5. Step 5: Solve for x
    x = 2,501,740,842.80/80,009.70
  6. Step 6: Final answer
    x = 31,267.97

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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.