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Finding the Fourth Proportional to 85,403.20, 128,104.80 and 80,564.80

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Solution

The fourth proportional to 85,403.20, 128,104.80 and 80,564.80 is: 120,847.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,403.20 : 128,104.80 = 80,564.80 : x
  2. Step 2: Convert to fraction form
    85,403.20/128,104.80 = 80,564.80/x
  3. Step 3: Cross multiply
    85,403.20x = 128,104.80 × 80,564.80
  4. Step 4: Simplify right side
    85,403.20x = 10,320,737,591.04
  5. Step 5: Solve for x
    x = 10,320,737,591.04/85,403.20
  6. Step 6: Final answer
    x = 120,847.20

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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.