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Finding the Fourth Proportional to 85,919.40, 128,879.10 and 84,607.20

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Solution

The fourth proportional to 85,919.40, 128,879.10 and 84,607.20 is: 126,910.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,919.40 : 128,879.10 = 84,607.20 : x
  2. Step 2: Convert to fraction form
    85,919.40/128,879.10 = 84,607.20/x
  3. Step 3: Cross multiply
    85,919.40x = 128,879.10 × 84,607.20
  4. Step 4: Simplify right side
    85,919.40x = 10,904,099,789.52
  5. Step 5: Solve for x
    x = 10,904,099,789.52/85,919.40
  6. Step 6: Final answer
    x = 126,910.80

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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.