Home / 90,991.20-136,632.60-68,829.60

Finding the Fourth Proportional to 90,991.20, 136,632.60 and 68,829.60

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Solution

The fourth proportional to 90,991.20, 136,632.60 and 68,829.60 is: 103,354.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,991.20 : 136,632.60 = 68,829.60 : x
  2. Step 2: Convert to fraction form
    90,991.20/136,632.60 = 68,829.60/x
  3. Step 3: Cross multiply
    90,991.20x = 136,632.60 × 68,829.60
  4. Step 4: Simplify right side
    90,991.20x = 9,404,367,204.96
  5. Step 5: Solve for x
    x = 9,404,367,204.96/90,991.20
  6. Step 6: Final answer
    x = 103,354.69

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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.