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Finding the Fourth Proportional to 80,511.80, 120,864.90 and 79,928.60

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Solution

The fourth proportional to 80,511.80, 120,864.90 and 79,928.60 is: 119,989.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,511.80 : 120,864.90 = 79,928.60 : x
  2. Step 2: Convert to fraction form
    80,511.80/120,864.90 = 79,928.60/x
  3. Step 3: Cross multiply
    80,511.80x = 120,864.90 × 79,928.60
  4. Step 4: Simplify right side
    80,511.80x = 9,660,562,246.14
  5. Step 5: Solve for x
    x = 9,660,562,246.14/80,511.80
  6. Step 6: Final answer
    x = 119,989.40

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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.