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Finding the Fourth Proportional to 85,940.40, 128,910.60 and 36,003.90

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Solution

The fourth proportional to 85,940.40, 128,910.60 and 36,003.90 is: 54,005.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,940.40 : 128,910.60 = 36,003.90 : x
  2. Step 2: Convert to fraction form
    85,940.40/128,910.60 = 36,003.90/x
  3. Step 3: Cross multiply
    85,940.40x = 128,910.60 × 36,003.90
  4. Step 4: Simplify right side
    85,940.40x = 4,641,284,351.34
  5. Step 5: Solve for x
    x = 4,641,284,351.34/85,940.40
  6. Step 6: Final answer
    x = 54,005.85

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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.