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Finding the Fourth Proportional to 84,311.20, 126,466.80 and 80,423.20

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Solution

The fourth proportional to 84,311.20, 126,466.80 and 80,423.20 is: 120,634.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,311.20 : 126,466.80 = 80,423.20 : x
  2. Step 2: Convert to fraction form
    84,311.20/126,466.80 = 80,423.20/x
  3. Step 3: Cross multiply
    84,311.20x = 126,466.80 × 80,423.20
  4. Step 4: Simplify right side
    84,311.20x = 10,170,864,749.76
  5. Step 5: Solve for x
    x = 10,170,864,749.76/84,311.20
  6. Step 6: Final answer
    x = 120,634.80

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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.