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Finding the Fourth Proportional to 80,615.20, 120,922.80 and 79,578.40

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Solution

The fourth proportional to 80,615.20, 120,922.80 and 79,578.40 is: 119,367.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,615.20 : 120,922.80 = 79,578.40 : x
  2. Step 2: Convert to fraction form
    80,615.20/120,922.80 = 79,578.40/x
  3. Step 3: Cross multiply
    80,615.20x = 120,922.80 × 79,578.40
  4. Step 4: Simplify right side
    80,615.20x = 9,622,842,947.52
  5. Step 5: Solve for x
    x = 9,622,842,947.52/80,615.20
  6. Step 6: Final answer
    x = 119,367.60

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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.