Home / 90,857.20-136,091.40-81,007.60

Finding the Fourth Proportional to 90,857.20, 136,091.40 and 81,007.60

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Solution

The fourth proportional to 90,857.20, 136,091.40 and 81,007.60 is: 121,338.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,857.20 : 136,091.40 = 81,007.60 : x
  2. Step 2: Convert to fraction form
    90,857.20/136,091.40 = 81,007.60/x
  3. Step 3: Cross multiply
    90,857.20x = 136,091.40 × 81,007.60
  4. Step 4: Simplify right side
    90,857.20x = 11,024,437,694.64
  5. Step 5: Solve for x
    x = 11,024,437,694.64/90,857.20
  6. Step 6: Final answer
    x = 121,338.07

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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.