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Finding the Fourth Proportional to 81,212.90, 121,830.79 and 25,057.58

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Solution

The fourth proportional to 81,212.90, 121,830.79 and 25,057.58 is: 37,589.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,212.90 : 121,830.79 = 25,057.58 : x
  2. Step 2: Convert to fraction form
    81,212.90/121,830.79 = 25,057.58/x
  3. Step 3: Cross multiply
    81,212.90x = 121,830.79 × 25,057.58
  4. Step 4: Simplify right side
    81,212.90x = 3,052,784,189.06
  5. Step 5: Solve for x
    x = 3,052,784,189.06/81,212.90
  6. Step 6: Final answer
    x = 37,589.89

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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.