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Finding the Fourth Proportional to 81,212.60, 121,775.70 and 34,412.60

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Solution

The fourth proportional to 81,212.60, 121,775.70 and 34,412.60 is: 51,600.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,212.60 : 121,775.70 = 34,412.60 : x
  2. Step 2: Convert to fraction form
    81,212.60/121,775.70 = 34,412.60/x
  3. Step 3: Cross multiply
    81,212.60x = 121,775.70 × 34,412.60
  4. Step 4: Simplify right side
    81,212.60x = 4,190,618,453.82
  5. Step 5: Solve for x
    x = 4,190,618,453.82/81,212.60
  6. Step 6: Final answer
    x = 51,600.59

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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.