Home / 80,660.46-120,990.28-20,688.68

Finding the Fourth Proportional to 80,660.46, 120,990.28 and 20,688.68

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Solution

The fourth proportional to 80,660.46, 120,990.28 and 20,688.68 is: 31,032.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,660.46 : 120,990.28 = 20,688.68 : x
  2. Step 2: Convert to fraction form
    80,660.46/120,990.28 = 20,688.68/x
  3. Step 3: Cross multiply
    80,660.46x = 120,990.28 × 20,688.68
  4. Step 4: Simplify right side
    80,660.46x = 2,503,129,186.03
  5. Step 5: Solve for x
    x = 2,503,129,186.03/80,660.46
  6. Step 6: Final answer
    x = 31,032.91

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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.