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Finding the Fourth Proportional to 80,657.80, 120,986.70 and 51,206.20

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Solution

The fourth proportional to 80,657.80, 120,986.70 and 51,206.20 is: 76,809.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,657.80 : 120,986.70 = 51,206.20 : x
  2. Step 2: Convert to fraction form
    80,657.80/120,986.70 = 51,206.20/x
  3. Step 3: Cross multiply
    80,657.80x = 120,986.70 × 51,206.20
  4. Step 4: Simplify right side
    80,657.80x = 6,195,269,157.54
  5. Step 5: Solve for x
    x = 6,195,269,157.54/80,657.80
  6. Step 6: Final answer
    x = 76,809.30

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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.