Home / 90,940.20-136,410.30-86,857.80

Finding the Fourth Proportional to 90,940.20, 136,410.30 and 86,857.80

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Solution

The fourth proportional to 90,940.20, 136,410.30 and 86,857.80 is: 130,286.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,940.20 : 136,410.30 = 86,857.80 : x
  2. Step 2: Convert to fraction form
    90,940.20/136,410.30 = 86,857.80/x
  3. Step 3: Cross multiply
    90,940.20x = 136,410.30 × 86,857.80
  4. Step 4: Simplify right side
    90,940.20x = 11,848,298,555.34
  5. Step 5: Solve for x
    x = 11,848,298,555.34/90,940.20
  6. Step 6: Final answer
    x = 130,286.70

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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.