Home / 81,406.20-122,109.30-53,412.60

Finding the Fourth Proportional to 81,406.20, 122,109.30 and 53,412.60

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Solution

The fourth proportional to 81,406.20, 122,109.30 and 53,412.60 is: 80,118.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,406.20 : 122,109.30 = 53,412.60 : x
  2. Step 2: Convert to fraction form
    81,406.20/122,109.30 = 53,412.60/x
  3. Step 3: Cross multiply
    81,406.20x = 122,109.30 × 53,412.60
  4. Step 4: Simplify right side
    81,406.20x = 6,522,175,197.18
  5. Step 5: Solve for x
    x = 6,522,175,197.18/81,406.20
  6. Step 6: Final answer
    x = 80,118.90

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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.