Home / 85,824.20-128,736.30-79,992.20

Finding the Fourth Proportional to 85,824.20, 128,736.30 and 79,992.20

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Solution

The fourth proportional to 85,824.20, 128,736.30 and 79,992.20 is: 119,988.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,824.20 : 128,736.30 = 79,992.20 : x
  2. Step 2: Convert to fraction form
    85,824.20/128,736.30 = 79,992.20/x
  3. Step 3: Cross multiply
    85,824.20x = 128,736.30 × 79,992.20
  4. Step 4: Simplify right side
    85,824.20x = 10,297,899,856.86
  5. Step 5: Solve for x
    x = 10,297,899,856.86/85,824.20
  6. Step 6: Final answer
    x = 119,988.30

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Similar ratio
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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.