Home / 85,540.70-128,311.05-82,260.20

Finding the Fourth Proportional to 85,540.70, 128,311.05 and 82,260.20

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Solution

The fourth proportional to 85,540.70, 128,311.05 and 82,260.20 is: 123,390.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,540.70 : 128,311.05 = 82,260.20 : x
  2. Step 2: Convert to fraction form
    85,540.70/128,311.05 = 82,260.20/x
  3. Step 3: Cross multiply
    85,540.70x = 128,311.05 × 82,260.20
  4. Step 4: Simplify right side
    85,540.70x = 10,554,892,635.21
  5. Step 5: Solve for x
    x = 10,554,892,635.21/85,540.70
  6. Step 6: Final answer
    x = 123,390.30

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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.