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Finding the Fourth Proportional to 85,408.80, 128,113.20 and 80,800.80

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Solution

The fourth proportional to 85,408.80, 128,113.20 and 80,800.80 is: 121,201.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,408.80 : 128,113.20 = 80,800.80 : x
  2. Step 2: Convert to fraction form
    85,408.80/128,113.20 = 80,800.80/x
  3. Step 3: Cross multiply
    85,408.80x = 128,113.20 × 80,800.80
  4. Step 4: Simplify right side
    85,408.80x = 10,351,649,050.56
  5. Step 5: Solve for x
    x = 10,351,649,050.56/85,408.80
  6. Step 6: Final answer
    x = 121,201.20

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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.