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Finding the Fourth Proportional to 80,619.20, 120,950.67 and 28,032.78

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Solution

The fourth proportional to 80,619.20, 120,950.67 and 28,032.78 is: 42,056.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,619.20 : 120,950.67 = 28,032.78 : x
  2. Step 2: Convert to fraction form
    80,619.20/120,950.67 = 28,032.78/x
  3. Step 3: Cross multiply
    80,619.20x = 120,950.67 × 28,032.78
  4. Step 4: Simplify right side
    80,619.20x = 3,390,583,522.96
  5. Step 5: Solve for x
    x = 3,390,583,522.96/80,619.20
  6. Step 6: Final answer
    x = 42,056.78

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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.