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Finding the Fourth Proportional to 80,020.72, 120,027.88 and 20,856.88

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Solution

The fourth proportional to 80,020.72, 120,027.88 and 20,856.88 is: 31,284.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,020.72 : 120,027.88 = 20,856.88 : x
  2. Step 2: Convert to fraction form
    80,020.72/120,027.88 = 20,856.88/x
  3. Step 3: Cross multiply
    80,020.72x = 120,027.88 × 20,856.88
  4. Step 4: Simplify right side
    80,020.72x = 2,503,407,089.81
  5. Step 5: Solve for x
    x = 2,503,407,089.81/80,020.72
  6. Step 6: Final answer
    x = 31,284.49

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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.