Home / 85,542.20-128,313.30-81,459.80

Finding the Fourth Proportional to 85,542.20, 128,313.30 and 81,459.80

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Solution

The fourth proportional to 85,542.20, 128,313.30 and 81,459.80 is: 122,189.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,542.20 : 128,313.30 = 81,459.80 : x
  2. Step 2: Convert to fraction form
    85,542.20/128,313.30 = 81,459.80/x
  3. Step 3: Cross multiply
    85,542.20x = 128,313.30 × 81,459.80
  4. Step 4: Simplify right side
    85,542.20x = 10,452,375,755.34
  5. Step 5: Solve for x
    x = 10,452,375,755.34/85,542.20
  6. Step 6: Final answer
    x = 122,189.70

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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.