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Finding the Fourth Proportional to 80,478.91, 120,836.86 and 45,009.72

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Solution

The fourth proportional to 80,478.91, 120,836.86 and 45,009.72 is: 67,580.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,478.91 : 120,836.86 = 45,009.72 : x
  2. Step 2: Convert to fraction form
    80,478.91/120,836.86 = 45,009.72/x
  3. Step 3: Cross multiply
    80,478.91x = 120,836.86 × 45,009.72
  4. Step 4: Simplify right side
    80,478.91x = 5,438,833,234.28
  5. Step 5: Solve for x
    x = 5,438,833,234.28/80,478.91
  6. Step 6: Final answer
    x = 67,580.85

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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.